Sonic 4 while marketed as 2D, is infact 100% 3D just like Rush, Unleashed, Colors and Generations - Neither game use Hand drawn sprites or backgrounds, they are all digitally rendered, so at this point what is the relevance of continuing with Sonic 4, if you already have Generations aside from the fact that Tails will be playable which I think Generations should simply include and save us some money.
Because of these 2 series running simultaneously we are actually not getting a fully fleshed out Sonic experience, we all complained about excessive characters, no body said remove every other playable chareacter and start dividing Sonic into different characters (Werehog, Classic, Modern, What's Next?).
This needs to stop!
It was back to the solo origins with Secret Rings but now it's like the 5th Solo adventure and I am sick of it, I want to Fly with Tails, Climb with Knuckles, hell I wouldn't even mind some short shooting miniquest with Gamma/Omega or Big fishing.