Well to be fair, what Sonic 06 took from the Adventures it took from the Adventures. The hub worlds, the character stages, the fuckton of characters to play as, character battles, that kind of thing. despite it's general shittiness, it DOES feel like an Adventure game. (Because it is, and don't think otherwise... Sonic 06 is supposed to be Sonic Adventure 3)
if they followed a similar formula of drawing inspiration from the Adventures and the good [parasitic bomb] they did POST 06, it could be pretty good. I think they could make a good SA3
Still, a rumor is just a rumor. Could be, and most likely until proven true, is, completely untrue.