Very recently, two of the IGN reviewers for Sonic Generations just showed off an hour long livestream of Sonic Generations. It was a shame that the footage wasn't directly recorded with a capture program, so the quality of the gameplay was extremely blurry. Regardless, it was at least clear enough for us to see. They showed off a few of the Classic Sonic side missions, as well as Modern Chemical Plant and Classic Speed Highway. But perhaps the biggest and best surprises (and spoilers) were the Perfect Chaos boss battle and Modern Crisis City.
I won't spoil too much here. For Perfect Chaos, the battle not only looks exciting, but the inner fanboy in me truly went giddy with joy when it started playing an amazing Open Your Heart remix. As for Crisis City.....this is what it should have been from the beginning. Not only is the music great, but this is certainly the most platforming-heavy of the stages I have seen so far. It is good to see that it's no longer "Boost to Win" like in HD Unleashed and there is a heavier focus on 3-D platforming rather than mostly 2-D like in Sonic Colors.
I kind of regret spoiling these, but I simply couldn't resist seeing 06 done right and Perfect Chaos looking more awesome. Just five more days guys.