Wizwad,
If you have covered that much info in a week or so, then you must be a wreck. But I think you enjoyed doing it.
Basicially MA2 is the setup with the new codebase to allow many more new features to be added. So at this point you are getting new things; new fish, new setting's panel for SSA, several minor coloring fixes that have been around for awhile, and so on. But the major improvement is under the hood, geared for the future.
As far as the opening and closing of mouths and gills and so on, those things will be added when the 3D background gets done at the latest. The pricing quandry is still slightly up in the air at the moment, but a totally definative 100% answer should be forth coming soon.