So far, I'm not really doing anything to get ready for the release of the new games. I'm playing through a challenge on Blue right now, but I started that a month or so ago. I picked up a file on Y that I hadn't done that much in (just shy of 2 badges so far), and it piqued my interest for the first time in a while, so I might play more of that. Mostly, though, I've actually been playing more of non-Pokemon games than I have in a while (just beat the original Legend of Zelda for the first time, and just started on A Link to the Past, which I have on GBA but never beat, and I've been playing a bit of Fantasy Life, too).
If my breeding apathy wears off, I might breed some Pokemon that I can send to the new game. If not, I have plenty of Pokemon to send already. I should probably go back to releasing stuff from Bank, though, as I am out of space. (I really wish they would let you buy a space expansion, e.g., $10/yr for 6000 Pokemon.)