If you weren’t tuned into the WWDC 2010 keynote address, salivating over this new iPhone 4 and waiting with the anticipation and eagerness of a child on the last day of school, what were you thinking? As Jobs put it during his presentation, “This is going to change everything all over again.”

My response to the iPhone 4 announcement was originally, “Wow.” But with every new announcement, “wow” started to feel like it wasn’t a strong enough word. What I felt was awe. I was on the edge of my seat literally. (I almost fell off the couch.) If you have no idea what I’m talking about, check out this video and you will.

Admittedly, what we saw was mostly further explanation of features that a lot of us already knew were in the works. But even though there will be plenty of critics complaining about what we didn’t get, let me list the eight things that we are getting that really caught my eye.

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1) The all-new design

The new iPhone 4 is only 9.3mm thin. It also has a stainless steel outer cover that doubles as the antenna for Bluetooth, WiFi, GPS, UMTS, and GSM. The iPhone now features a front-facing camera and an LED flash on the back. I am psyched about this. I was a little down when the iPhone 3GS looked exactly like the 3G version. This looks completely different. That antenna system, which works with the stainless steel banding around the handset, is genius. Anything that can help optimize reception is a good thing. I’m also really excited about the bigger battery. It takes up a good portion of the inside and can hold enough charge for 300 hours of standby. The 18 months that went into this handset were well used.

2) Retina display

All in favor? Looks like the “eyes” have it. The iPhone 4 boasts the densest screen on the market. At 326 ppi, that is more than the number of pixels per inch that the human retina can distinguish from a foot away (300 ppi). It uses IPS technology for a wide viewing angle (just like the iPad) and has an 800:1 contrast ratio. With the screen size still at 3.5 inches and a new resolution at 960×640, it holds 4 times more pixels than previous iPhones. It keeps the same aspect ratio, so developers do not have to worry — old apps and new apps alike will look gorgeous.

3) Can you process this?

The new iPhone uses the same A4 chip as the iPad. Along with a bigger battery, the chip enables up to 7 hours of talk time, 6 hours 3G browsing, and as stated previously, 300 hours of standby. Storage comes in 16GB and 32GB. It’s a shame we don’t get the 64GB, like on the iPod Touch, though.

4) Gyroscope

The addition of the gyroscope will take gaming to a whole new level. It allows for 3-axis movements (and 6, if you count the accelerometer), and developers can use the new CoreMotion API for precision movements. Should we expect to see games like iSurgery?

5) Camera

I think this is what a lot of us were waiting for. iPhone 4 now boasts a 5MP and HD RECORDING! Users can shoot 720p video at 30 fps. Combine that with iMovie, and you can be an amateur Spielberg! The addition of the front camera is nothing short of awesome. (I’ll get to that later.) As an added bonus, each video and picture has embedded Geolocation, which means there will be no more, “Now, where did I take this picture?”

6) iOS4

“iOS4″ is the official name for what used to be called “iPhone OS 4.” Personally, I’m glad they changed the name. iPhone OS covered the iPhone. Since the original release of the iPhone, there have been some additions to the family — namely the iPod Touch and iPad. It just wouldn’t do to have the operating system for all three devices be named iPhone OS or have different names. iOS 4 includes over 100 new features, a few being multitasking, unified inbox, folders, wallpapers, and so much more. Google is still the default search engine, but users can choose from Yahoo or Bing as well. iOS 4 will be free to all 3GS, 3G, and iPod Touch 2nd generation users on June 21st, however not every feature (Cough….Multitasking…Cough) will work on the 8GB iPod Touch.

7) iBooks for all

iBooks, previously available for the iPad exclusively, is now available on the iPhone and iTouch. Along with purchased e-books from Apple’s bookstore, users can view pdf files. Also, you only have to buy the book once. The book can be synced between all your iDevices down to the page number and any notes you may have taken. This is extremely handy. Now you can read you books on your iPad at home, then when you want to travel light, just sync them over to your iPhone. The pdf capability is great; a lot of presentations and documents you make on the computer can be saved as a pdf, so this makes it easier to read them anywhere.

8) iAd

Advertisements allow developers to make money on free and low-cost apps in the App Store. With the new iAd platform, there’s a standardized, supported platform to create in-app ads — which mean you don’t get shot out of a game to some webpage in safari. Apple sells and hosts the ads, and the same way developers get paid for their apps, they get a 60% cut via iTunes connect. iAds will be enabled July 1st, but Apple has been selling spots to companies for 8 weeks. They have already sold over $60 million. JP Morgan estimated the entire mobile ad market to be worth $250 million this year, which makes this a pretty good figure.

I know I said there are eight things that caught my eye, but don’t accuse me of not being able to count. Jobs just had to add “one more thing” at the end of the presentation. Lucky for us, it’s a good “one more thing.”

9) FaceTime

FaceTime allows users to chat using the front-facing or rear camera to other iPhone users. As of now, it only works over WiFi. Apple’s looking into the possibility of adding 3G compatibility, but that’s pretty much up to the carrier (AT&T). In the mean time, it means the networks won’t get slowed down.

I think vid chat will change the way people interact with each other over the phone. It hasn’t been massively adopted yet, although there are other handsets that offer this, but I’m excited about how this feature will develop.

So how much is all this going to cost? With a 2-year contract, $199 for the 16GB model and $299 for the 32GB model. If you already have an iPhone with a contract expiring in 2010, AT&T will let you upgrade to an iPhone 4. But you have to sign your soul away for another two years. You can choose from black or white, and add the bumper cases to make your iPhone 4 fit your style.

Pre-orders start June 15th, with the phone in stores on June 24th. Eighteen more countries will get it in July, 24 more in August, and 40 more in September (totaling 88 countries).

Well, what do you think about the new iPhone 4? Any specific feature you have your eyes on? Or was there something lacking that disappointed you? Let us know in the comments below.