I can't think of any game that makes sense.
if it is DQX, then what's the purpose of the trailer being in the collection or TGS?Just so people can have it. I mean did anyone really expect us to not see the trailer before the collection came out? Though if they don't show a DQX trailer here then damn this point sucks doesn't it?
if it is a 3DS game, then it should be in Nintendo 3DS conference.Means the game at the 3DS event will be something else which is nice.
if it is a Vita or PSP or PS3 game, why announce it just before your next main game is going to be revealed on the rival's platform?It would most likely be a spinoff if it was a PSP, vita, or PS3 game. Don't think they are ready for DQXI ATM.