User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-119.93.94.58-20121022090046/@comment-5489419-20121022111805

If you're coming from MHFU, there's a LOT of changes to weapons' move sets; if you are coming from Portable 3rd / Monster Hunter Tri, then there isn't much. I think it's mostly just adding the 3D and the touch screen stuff plus the new subspecies and end game boss, Guran Miraosu (however it is spelled).

Here's some details on the weapons:

Great Sword: No changes from Monster Hunter 3 (tri~) that I know of.

Longsword: No changes that I know of since Monster Hunter Tri.

Sword and Shield: Zilch since Tri.

Dual Swords: New weapon in Tri Ultimate (if you're coming from Monster Hunter Tri, that is)! Same attacks and mechanics as in MHP3rd.

Hammer: All hammer attacks now deal K.O. damage. This was a change from Tri, but nothing new to MHP3rd.

Hunting Horn: New weapon in Tri Ultimate (again, only if you skipped MHP3rd)! Completely overhauled mechanics. You now play notes when you attack and go into rehearsal mode (R-button) after an attack to play the string of notes!

Light Bowgun: I know there was something new about the weapon in MH3U / MHP3rd, but I can't remember it for the life of me! Please, someone clarify this for the both of us!

Heavy Bowgun: In MHP3rd it was given a new mechanic called "Siege Mode," where you basically take a knee on the ground and can continuously fire a certain type of shot without reloading (correct me if I'm wrong/elaborate!)

Bow: New weapon in Monster Hunter 3 (tri~) Ultimate (if you haven't played P3rd blah, blah, blah)! When fully charged, Gunners point their bows skyward and unleash a flurry of arrows that not only damage the monster but also inflict K.O. damage on it if they hit the old noggin! They also receive a new coating, if I remember correctly.

Phew! That's all I know.