Quick overview while I work on changes:
When I say 'changed', it means the data was changed, not that it is very different than what it was - it could mean a simple tweak/fix.
Main (uncategorized)
* Data.wz is now split up (Base.wz, Item.wz, Sound.wz, etc).
* Our world icons are now high-rez, like MapleSEA.
* Tamable monsters added.
* Swear words updated.
* Quest categories?
* 184 new monsters.
* 276 changd NPCs.
* 54 removed NPCs.
* 63 new NPCs.
* 106 new reactors.
* Music changed (JP music removed? could have just been reorganized though).
* We have the new armor stuff that was added to JMS awhile ago, see this thread.
* Many maps changed and many maps added.
Items
* 59 changed accessory items.
* 10 new accessory items.
* Afterimage sprites updated (the attack trails, etc)
* 20 changed hat items.
* 22 new hat items.
* 5 new cape items.
* 12 changed top items.
* 12 new top items.
* 272 changed faces (all existing faces).
* 48 new faces.
* 5 changed glove items.
* 15 new glove items.
* 40 new hair.
* 7 changed overall items.
* 11 new overall items.
* 15 new bottom items.
* 13 changed pet equip items.
* 6 new pet equip items.
* 5 new ring items.
* 1 changed shield item.
* 7 new shield items.
* 2 changed shoe items.
* 8 new shoe items.
* 11 changed weapon items.
* 47 new weapon items.
* Cash items updated/changed/etc.
* Consume items updated/changed/etc.
* Etc items updated/changed/etc.
* 21 changed pets (all existing?).
* 3 new pets.
* 1 new morph.
Skills
* Fourth job data is now in, but not the string data for them.
* Beginnger skills changed.
* Crusader skills changed.
* White Knight skills changed.
* Chief Bandit skills changed.
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Specifics
Skills
* Fourth job data in, no string data yet though.
* Beginner skill Legendary Spirit was added.
* Beginner skill Monster Rider was added.
* Crusader skill Panic : Sword had more sprites added to it (?).
* Crusader skill Panic : Axe had more sprites added to it (?).
* Crusader skill Coma : Sword had more sprites added to it (?).
* Crusader skill Coma : Axe had more sprites added to it (?).
* White Knight skill Charged Blow had more sprites added to it (?).
* Chief Bandit skill Assaulter now requires a dagger to be equipped.