I saw the trailer, it kinda looks weird looking at the ol'school Sonic and the new one toe to toe, but then again it's awesome!
From what i've been reading, it looks to me that Sonic 4 has a look and feel like it's original counterpart, no doubt it's a must have for any retro sonic fans.
As for it's storyline well... I just hope Sega doesn't screw this up much like it's done in the past,*cough*Sonic*cough*Heroes...
So for his 20th anniversary I think I'll go ahead and get Sonic 4 for PS3 which looks like a good choice.
I originally started playing the first sonic (original) back in 2001, now it's time for these episodes to come out.