User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-3298463-20110908151103

Hapurubokka possibly confirmed? Look at the bow that guy in the left is wielding in this image where they battle Plesioth underwater: http://www.capcom.co.jp/monsterhunter/3G/about03.html

Doesn't it look an awful lot like Hapu's bow, 64th Division Bow?

That would mean at least some of the P3rd monsters are included.