if they really are aiming this more at a western audience, I would expect DLC expansions instead of just new standalone games.
I would also expect this to launch with FAR less content than MH4U, MHGenerations, and MHXX. I'm sure they want to avoid some of the backlash they got back in Tri, but they can't get away with just bringing over 1st-gen-ass monsters like Gravios to fill the roster out this time. The new monster interactions are going to add a lot of work too.
At least this time all the weapons are back, unlike Tri, though the chance of new weapons seems really low with stuff like the grappling hook or the sling. But, yeah, I'd be surprised if World has not a similar monster count to Tri. I don't think this is necessarily bad for new players, but for people that played a G version, I'm certain it will be a bit underwhelming. Hopefully the game makes up for it by making really interesting new monsters.