I've only seen the ads so far at bus stops / billboards but I like the idea of Sonic being in it. It won't have been the first time that Disney has crossed the gaming barrier though because there were Kingdom Hearts I / II games which crossed with various Final Fantasy titles.
What other characters are in Wreck-It as well as Sonic? I strongly hope they've focused on the original Sonic from 20 years ago. Maybe it was deviantART that tarnished my view of Sonic, but when I see pictures on there, they tend to be badly re-coloured traces of Sonic done in MS Paint. There also appear to be dozens of different Sonic characters now, where in my days, it was Sonic, Tails and Knuckles.