The concept art for Amy certainly backs this up, as the background looks completely industrialised. That might sound a little far-fetched, but it would be in the spirit of Sonic CD, the game that ...

With Amy Rose set to make her long-awaited ... Lanolin got her start in the Sonic franchise as a background character from early issues of the IDW Publishing comics, only appearing in brief ...

Perhaps it's that chaos that will lead to the mash-up between the heroes becoming literal, as Sonic is mashed-up with Flash, ...