I don't think FTP will save this game either. Its gameplay are just too freaking linear to me. You follow ? to max level, then you are forced to run dungeon for raid access. After that, it is pretty much between raiding two instances and same old daily quests that bored the shit out of my mind...
That's where I'm sort of wary about this. I think they'll do a good job drawing people in. They've streamlined much of the early game, dumbed down some parts, moved around content so you don't have to do the quest grind if you don't want to (especially since faction is no longer needed for attunement). The game is a lot more friendly to new players, and in the past few updates, they've also done a decent job filling out the end-game content, particularly in giving solo players things to do (contracts, veteran expeditions, etc.).
But, they really better have more raids and end-game content waiting in the wings or they're just going to run into the same problem they did before. Yes, attunement has been made much easier, but this isn't like release where it was going to take people months to get through the raids and thus have something to keep them playing. Many of the new players are going to end up in guilds who are already half-way or more through the raids that are in the game. While I don't think there are many guilds that have cleared everything yet, it likely won't be long before guilds start hitting the wall.
I know at least one raid is in development, but hopefully it's not something they have to wait for the 3-month cycle to deliver. It just sort of seems like they did the typical MMO thing of putting all of their energy into the early game, believing they can address the end-game content before enough people get there.
Classes were boring as fuck. I don't think they were ever updated.
Esper is probably the only one that plays differently than it did at launch. They removed all the stupid standing around required of the class, and made it so you'll get bonus damage for timing your attacks correctly instead.
All the other classes have been tweaked to varying degrees, of course. I know Engineers had one ability revamped on Test, and obviously the new stats have changed how certain attacks work. But, yeah, I don't think there have been any large, sweeping changes that have made how classes play much different.