Well, the required amount of experience for levels 2-100 have been decreased, and many players' levels were increased to fit the accumulated experience. I recently went from level 64 to 74. There's now a stamina bar, a perfect guard feature, and counterattack move, more details here:
viewtopic.php?f=10&t=5093There's also a new(ish) enemy in the game, called Goldaruma. Killing it gives you a buttload of EXP, money, and drops Ryou boxes. Guide to it here:
viewtopic.php?f=12&t=5036A few events, there's a Christmas event going on that's pretty damn difficult, but worth it, (depending on your opinion) there's now character emotes, two new bosses that you can craft weapons from, etc.