User blog comment:Kogath/Monster Hunter 4 Ultimate for the Nintendo 3DS/@comment-24995830-20150413174534/@comment-5853890-20150414211520

Lava won't be returning because of the uproar when he and Hypnotrace appeared in FU. Capcom stated that no Frontier Monsters wil be appearing in the Main Series but those two did and there was a huge uproar. Even if he did, he needs a huge revamp seeing as he was nothing but a copy-n-paste weaker version of Plessy without the hipcheck and an even less move pool at the time of his Main Series debut.

If the crabs are a stable returning class I say Shogun has a chance, but I would rather prefer a new crapecoen (can never remember how to spell it).

Yama was more boring than Lao, he'll need a huge revamp if he does return. And I would suggest a Mohran style revamp.

As for the Fear stuff goes, can't really say as a theme would work because hunter are sposed to be moreover on the "fearless" side.