If all other iterations of MH have anything to say about it, most likely than not, a portable nintendo made device will see one or more releases of MH.
As for what fights we would like to see... When I want a particular fight, I tend to play that game... like for example, when I want to fight Lao Sheng Lung, I go back to MHFU.... etc.
Must have monsters, however: Rajang, Deviljho, Daora, Teostra & Fatalis. Mainly because these monsters touch the full gamete of fight ranges, from humanoid, dinosaur, wind, explosion, and true dragon.
Of course, that is just my opinion.