I gotta say...I'm really liking it so far. Once all of the features get finished, I think I might just have to make the switch from Android.
-Twitter doesn't work yet.
-Facebook Chat brings me to a page that says "invalid address".
-Bing Maps looks like its the full TTS version, but I'll have to test on my way home
-IE9 seems nice and has tabs
-Facebook notifications show up in the Me hub
-You can create groups in your People hub and pin it to the start screen (great way to make your most contacted people easier to find)
-Program list now has letter separation which adds to the list, but lets you click on a letter to skip to that section
-Some more settings compared to the old one
-Camera can now save settings and you can turn off the shutter sound
-Battery Saver Mode can disable online services when your battery gets low
-In Battery Saver settings you can see your battery life %, estimated time remaining and time since last charge (right now I'm at 75% and it says I can go another day and 6 hours...which is hard to believe lol)
-You can to voice-to-text now to compose SMS
-Office looks like it synced my docs from SkyDrive
That's all I've noticed so far...