I'm pretty excited too. I think it plays a lot better from the Temple to the Crater than it did previously, and I was able to make some devious things happen with some of the new bosses. Right now I've got to put all the support materials together such as a new manual and, more importantly, an extensive list of where to find all the items, Materia, E.Skills, and some notes on why certain things were changed; it was a common complaint that it was tough to track down specific stuff because it was shuffled around quite a bit but a list should sort it out.
Right now I'm adding whatever small touches I can and testing them out. Mostly I'm just making the new NPCs a bit more animated, refining their dialogue, and trying to improve the 9 character-specific sidequests which maybe weren't very side-questy (a lot of their bosses weren't too great either in terms of AI but I reckon the revised batch should be a better fight). What I'm looking forward to is just adding extra end-game stuff every few weeks or so to keep building the mod up and up; wasn't able to do it properly before because the mod lost it's balance completely going into Disc 2. That should help things to tick over until I get this New Game+ campaign scripted up and rolling. And I'm always open to ideas for stuff to put in if you have suggestions; got a big notepad full of them that'll (probably) get implemented at some point.