1) I highly doubt it holds a candle to Siri, although I have yet to try that function.
2) not sure what you mean by that
3) developer environment means shit if there's no apps.
1) It can launch third party apps.
2) facebook and twitter photos appearing in one place, app cards from bing search etc.
3) well there are apps...
4) office integration
5) live information on start screen
6) Better music experience