It's exactly the same game with flashy new graphics! You like this? This "makes you salivate"? The graphics of the original were perfectly fine. I guess this is the future of gaming. Same old same old -- but with new graphics! Settlers 2 is doing the same thing. Same game with new 3D graphics. And the graphics in both games is in fact the same looking as the old graphics, but just in 3D and slightly more decorous.
Have you guys seen the game play demo footage? The graphics have indeed 3D sure, that's the logical approach, but it's not mostly the same old same old as you put, there's classic units, along side new units, there's new game play technologies that are put into play, such as some ground units being able to avoid obstacles such as cliffs, new interesting effect mechanics, and beautiful looking terrain (for the demo they used a space platform, in which background environment looks more realistic (planet, asteroids etc))
Well there's no "hero" units (like in Warcraft 3) per say, but there are apparently powerful "unique" if you will, units in which only one may be fielded in the battlefield at a time, they are not like heroes in Warcraft 3, which gain levels and can learn spells, but have set abilities like most other "spell" wielding unit for that race. I don't mind this at all, as they thankfully have not followed the hero approach from Warcraft 3.
I'm also sure "hero" units as they were in Starcraft, will return in Starcraft 2, available in single player campaigns and other games...
All in all, Starcraft 2 is looking good, I'm sure people would have been very angry and disappointed if the demo hardly resembled the original game.