Actually they put up new detailed info on it here:
Used to be a very broad preview, now it has some real info.
Some of this stuff is stupid (like having icons on the screen directly above the dock....with those same icons....just put it on the dock and enjoy the desktop background. Icons are why Windows looks like shit.), some of this stuff is a no-brainer-how-did-this-not-get-made-the-first-time addition (like full screen, really? That's innovative?), and some of it seems to be the same thing renamed (how is mission control new...? Expose...?). Dunno, first impression I guess.
Looking forward to:
-Full screen because it's ludicrous that you can't do that anyway
-New touchpad features, that is the best part of a Mac laptop
-Versions, this will be a great tool for me and likely others
-Resume feature, seriously that's dope. Update software, restart, and don't have to open up all your stuff agian? Sick. Love that.
-Mail- looks like a nice mix of Microsoft Outlook and G-mail. Like the layout
-Airdrop - new options for sharing and transferring info are always good in my house
