1) The game isn't out yet, and those screenshots are not from a definitive build, so we may expect some improvements, seeing how Capcom has managed to push 3DS's limits.
2) It's a 3DS game, so their top priorities would ideally be a rock-solid framerate, and a seamless funny gameplay, over any frills and thrills.
3) Best selling Monster hunter games so far were on PSP, but that was not a big issues for Japanese fans of the series apparently, as in Japan - that's where pretty much all MH fanbase is - it is popular as a handheld game.
This one is bound to sell shedloads, hopefully it will be lots of fun and bring new features; this is what matters methinks, as much as I'd like a home-console version.