Just preordered Y at Target last night.
As for the new Pokemon, Noivern and Pancham have to be my favorites. When I first saw Noivern during the E3 livestream, I was afraid it'd be the Kalos region's equivalent of Crobat and Swoobat... Thankfully it isn't. Noivern is most likely going to be on my team, especially if you can get its basic form early on.
Sky Battles and Horde Encounters seem interesting to me. Sure, they're new gimmicks, but they looked pretty cool imo. Just imagine walking into a cave, and first thing, finding a horde of Zubat...
Anyway, I'll definitely be picking Chespin as my starter (#ChespinChamps), and I'll also pick up Noivern, Pancham, and possibly the fire cub Pokemon. X and Y have the potential to be great games, maybe on par with Gen 3 and Gen 5.
Oh, also: Didn't see this posted anywhere on the last couple of pages, but the official worldwide release date is
October 12th. Kind of odd, seeing as that's a Saturday, and Pokemon games are usually released on Sundays... But hey, one less day to wait, I guess