User blog comment:Lord Loss/Discussion of the Week: Bows/@comment-74.120.190.101-20121219142325/@comment-5771144-20121220105850

I think it will do, yes. MH3U is more or less MH Tri and MHP3rd combined with additional monsters and content. So I'd expect it to have the latest changes to weapon mechanics =).

I can't see why they wouldn't have the Arrow Rain attack. Even still, it'll be a great time next year for all of us hunters!