User blog comment:Commdor/Game Informer ME3 Preview (Feb. 2012)/@comment-3053284-20120110110727/@comment-123.98.131.2-20120110112613

I wouldn't call it groundbreakingly original, but it's hardly a "clichè". Also it's hardly surprising that the species that has been a focus of the series from day 1 would play a major role in the resolution of the franchise.

Also this is info from almost the beginning of the game. A twist towards the end isn't outside the realm of possibility.