User blog comment:Mckrongs/Monster Hunter 4 for the Nintendo 3DS/@comment-6050823-20130423214633/@comment-6050823-20130424215431

Ruins Field = Forest areas from previous generations.

Unknown Sea of Trees = Temperate Forest like but,shows alot more similarites to the Old Jungle,so could be either one.

Primeval Forest = It's enviroment pretty much screams swamp.Eerie,mysterious,and pretty much in the unknown.

Underground Caves = ?(There is a Volcano in the background along with smoke and hot springs in the area,so possibly the 4th Gen Volcano or atleast close to it.)

A decent few of the 3rd Gen monsters have a good chance of returning but,afew of them not so much.In fact,I believe some of the new classes and monsters could be replacing the older classes.Afew decent examples could be,the Snake Dragon class could possibly be replacing the Leviathans and the Chelicera class could possibly be replacing the Carapaceons(I'm not really to sure about the Amphibians.Maybe Brute Wyverns?).Speaking of monsters,they've still haven't shown their Powerhouse Monster for the 4th Gen.So far the only three Powerhouse Monsters we have are Yian Garuga(1st Gen),Rajang(2nd Gen),and Deviljho(3rd Gen) but,I assume their going to reveal it pretty soon.