Vita's sales is now approaching the level of Dreamcast sales.

[Kenology]

VicViper said:

With this I agree, if not at TGS, it doesn't matter anymore. My point was always clear for Vita. Don't let MH4 launch on 3DS exclusively. It's like the breaking point. If they don't announce it now, they won't announce it before "winter 2013" for sure.

Even if, for the sake of discussion ('cause I don't think it's likely to happen), Vita gets a port of MH4...  How would it really do anything for Vita to distinguish itself from the 3DS?  It would move some units but to really be significant it needs it as an exclusive.  Having the game while it's still on the 3DS doesn't really do much for the Vita.  MH4 would be the Vita's only significant killer app while it would just be ONE title in a long list of killer apps for the 3DS, it won't really help the Vita at all.