User blog comment:Lord Loss/Monster Hunter Frontier G 2 Discussion/@comment-6050823-20130822202428/@comment-429226-20130823015039

The fan theory weapon To me it looks like a magic staff spear?, similar to a gunlance but uses and shoots a element of the monster its made from. (ex: Rathalos would shoot fire balls.)

The actual official concept weapon looks like a jack hammer tonfa of some kind. (Most likely would be a strong element based weapon) Of course we can only guess, I hope the concept art a stepping stone to something greater...