The trailer for the DMC4 that we wound up getting (where Nero was confirmed to be a thing) debuted at TGS as well.
Sure, but we'd already had two CG teasers at E3 2005 and 2006 by then.
But DMC3 Special Edition was revealed at TGS, I just remembered.
Didn't Revalations 2 get announced at TGS?
No, it was announced a few weeks before, but still in September.