I've compiled all the hero icon with names/stats (minus axe/pudge, as they haven't been played yet) off the official dota2 website. I understand that some pixels are terribly off, but rest assured, this wasn't photoshopped. [just painted :X]
A lovely website has made a nice layout with ingame pictures of most of the heroes HERE.
Customizable hotkeys, manabars, and LoL type health bars incoming (Each mark represents 200 hp). Also no more damage ranges. Icons at top were just hero icons.
At this point I'm inclined to believe this is real. If DOTA2 really looks like this, it's better they leak the ingame graphics now (a couple days away from the reveal) and have it stew in people's minds. This way they won't have more people instantly rejecting it because it looks different.
Model changes? Check.
Graphics change? Check.
User Interface changes? Check.
What's left to cope with:
Comparison of the 4 games (HoN hero is NOT DB):
VS (and Blitzcrank) at fountain (sorry for the unevenness):
Hero Names (speculation, discuss or agree/disagree):