For those uninterested in links:
They've added the Dark Knight and Onion Knight.
Dark Knights are somewhat like Gaffgarion, your boss from the first battle, and can use Fell Swords, two-handed swords obtainable in multiplayer only. In my opinion sword-and-board combos still beat it, if you can't dual-wield. You'll need to MASTER Knight and Black Mage, and get several other classes to 8th level, AS WELL as run out the counter on at least 20 enemies. By the time you can be a dark knight, you probably won't need it

It's the best way for Ramza to be a unique class, though, on the level of Orlandeau and Agrias
Onion Knights are a weirder class, and even less useful for solo flyers. Onion Knights can equip any weapon, but can't use abilities. They level up according to how many classes your character has mastered, and get massive stat bonuses based on that. They can also wear the Onion equipment, which is multiplayer-obtainable only.
In addition to those 2 classes, Luso and Balthier from the next FF Tactics Advance game and FFXII, respectively, can join. I can't remember what Luso is, but Balthier is a vastly improved version of Mustadio.
The icing on the cake is the breathtaking retranslation. You kids might not cotton much for "ye olde" language, but it's far improved from the original. I appreciate that they kept "spoony bard" though.