You still didn't tell me one thing World of Warcraft did that was revolutionary. It didn't do anything. Unless broken servers, loot lag, un-finished end-game content, place holder art for gear, and no PVP system is considered revolutionary. Everything else had been done before. Literally everything. It was a step forward because of how good the engine was, which made the entire game feel next-gen compared to something like EQ or SWG.
That doesn't make WoW bad. I have been playing the game since beta. It's a fantastic game, but it did nothing that was revolutionary until much later in it's release.
In terms of "guild ships" or airships in DDO, they work fundamentally different. Including possibly docking onto a guild ship from personal fighter, live-action combat missions, story lines pertaining to your specific capitol ship, and possible PVP involvement.
The dialogue system is also not being "shoe-horned" into the game. The hero engine had specific features making the addition of a dialogue system possible. So Bioware is taking one of their staples and adapting it to an MMORPG. There are certain aspects of it, such as group interaction on a multi-player, story impacting scale, they are new and unqiue. Regardless of if it was done in a single player game or not, it's still a first for MMORPG's.
Now I am not saying SWTOR is this totally original, mind blowing, revolutionary MMO. It isn't. Will it become one? Who knows. It takes very typical Western MMORPG elements, such as the combat, UI design, chat system, dungeon system etc., and adds Bioware staples into the mix.
I think of SWTOR comes out and is successful, their full voiced, cut-scene based main-story based quests will revolutionize the way MMORPG's tell the main sotry in the future. You will not be able to go from something like that, back to important story missions being told via question marks and dialogue box's.