Alrighty, do not know where to start. Just prepare to read O_O.
Some of the major changes are the village elder cat, basically a high rank quest giver that you can ONLY do alone. Then there are the 3 new HR 7, 8, and 9. As luck would have it, these new ranks have new wyverns and other baddies. Theres the volganos, the "lava fishie" that is a sub species of the plessy. Its got simmilar moves, but it mostly slithers on the ground and does a lot of damage, but the best part is that its hip check doesnt have a MASSIVLY MASSIVE hitbox like its predicessor. Then there is the Hypnoc, brached off of the kut ku. It is very small and is the first new baddie you will meet. It utillizes sleeping gas to kill you, but it is overall very simple to kill in any rank. Then theres the Ucamulbas (not sure if spelled right) which is the end game psuedo-wyvern, basically an icy akantor, you fight it in a battle ground like the akantor, but it will be in the snowy mountains rather than the volcano. Theres the queen vespoid, which i belive is a joke as it is very easy and you can make the Queen vesspy gun. OH, they also added another giant, the Yamatsukami, a giant floating octopus that grows dragon moss g and dragon wood g on its back/head. Its a pretty easy battle, but beware it "inhale attack" as it is a one hit ko, UNLESS you have the survival skill that will protect you from one hit ko attacks. Perhaps the scariest new wyvern is the Naruga Kuruga. Physically it is similar to the tigrex, but its move set is almost completely different. While the tigrex only has one charge attack and one jump attack, the naruga has like 3 of each and also being one of the fastest wyverns, it is very deadly. Then to wrap it all up, the naruga's rage mode spikes up its tail spikes and causes it eyes to glow a bright red that streaks through the air as it moves (like those old iPod commercials). Then there are new equipment rarities, 9 is yellow, and 10 is purple. Simmilar to s and u sets of armor, there are x and z sets, x being lesser to z,but thats no big deal cept for kirin x mail, ITS AMAZIN, specially for female lol. Then the new OP weapons such as the Uca hammer which has 1800+ raw power and 100 ice.
In addittion to new weapons and armors, there are new higher rank ores. The two main new ones are Etherlite and Melange ore, both are pretty rare, but Melange are a pain to farm. The two main new insects are Emperor locust and phantom butterflies which, like the ores, are both rare, but the phantom butterflies are VERY annoying to farm. Other than these new tings, but there are also....upgrades.
There is a new function called media download which uses some extra memory on your Memory stick to greatly reduce loading times in game. There are new expansions in the farm which are mainly more mining spots and bug searching spots. They finally added animations to weapons, such as the Uca lance. Basically its a giant icy drill that spins, the hammer is like a blunt digging devices, the head spins, and other things. One of the GREATEST upgrades though is the abillity to send items to item box when you are in the farm rather than discarding items. It always bugged me having to discard that shiny pure crystal in F2 to get that Fire cell stone, but not any more.
All in all, i hardly call it an expansion, but rather an entirely new game. I would DEFINATLY get it, ONLY if you are not bored of Monster Hunter as all the best changes dont come until you finish ALL of the village cheif's levels, not all the quests, but the stars.
Definatly a 100/10 and definatly worth the 1000 hours you'll pump into this game.
GET IT!!!