Sonic 2 HD

[Vipershark]

If I recall correctly, they're reworking the game engine as well.

I don't recall if they're going to replicate the original game's glitches or not, though. I think one of the original plans was to replicate Sonic 3's engine to use for this.

This is an obvious graphical and musical overhaul, and adds online and other stuff as Rokkan said.
It's not just an upscaled game.

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tbh it looks like sonic 3 in sonic 2

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at least from the trailer it does, the screens look like a flash game :\

watch the video in its native size on youtube itself
tsr resizes the video window so you can't see much detail