Well the Greninja plush is large at almost 11 inches. The Mega plush are smaller than that. The Pokemon Center Store already has the Y plush listed here (and is only 8 inches). So if you just want the plush of Y it's there. No X yet, though.
Here's a little thing I whipped together of the different bonuses.
Generally speaking and pure speculation;
Target *should* have added something to the cards, although this is the last week for their preorder. They added pins for XY and a Mario Kart keychain for MK8, but nothing for ORAS. That leaves me to believe they'll have something on launch day.
TRU might have something else for launch. They usually have neat things for preorders...even in the least some money off when you pick up.
I think all of the stores might have the UK figures on launch day...but I'm really surprised we had no mention of them.
Japan also wins again for awesome figures and stuff... ;-;