HYPE!!! Also, I really wonder how they are planning on implementing the last point that was brought up (Gen 1 Pokemon from the new VC re-release of Red/Blue/Yellow being transferable to Moon/Sun) since, as far as I know, the IV system in the first Gen was significantly different from the one we currently have in place, as well as the fact that Genders, Natures, Abilities, ect. weren't available in those games.
What I'm thinking is that the ingame? converting service in Sun and Moon will probably work like this gen 1 to 3 conversion tool. Dunno how natures are going to work though since they affect stat numbers but maybe they'll just assign a random one or something?
But what I really want to see is whether you can send glitch Pokemon up to the Bank or not since it looks like glitches are working in the RBY ports. Like I'm thinking there will be checks in place which will stop you from sending them up, but there are so many glitch Pokemon that some might find their way up. There's also a fanmade Bank which allows you to store Pokemon locally, so if that gets updated sometime down the road then maybe the glitch Pokemon will be able to get in through that? I don't know what sorta hack checks they have in place on that though. Guess we'll just have to wait and see ^^
Same way they did gave a second ability to pokemon which only had one on a previous game. Each pokemon has a set of data that controls whatever change they'll suffer when transferred to another gen (and something they specifically set up for pokemon coming from gen 1), so I don't think it'll be a problem.
I guess it's a little different since the IV/EV/general Pokemon structure system changes were a bit more radical than the addition to multiple abilities Since you're going from 0-15 IVs to 0-31, then 0-65535 EVs to 0-510, and then personality values and all that.