Skylanders Swap Force. Portalmasters who pre-order the game at Target will get an exclusive physical trading card that grants upgrades in the game when placed on the new Portal of Power.
Swap Force's marquee feature is that it uses characters with two parts that can be mixed and matched, but these specially branded trading cards will work as well.
There's also an ongoing deal (at all retailers) that grants a free "Lightcore Hex" Skylanders Giants character when you pre-order a starter pack. This Giants character, like all of the other characters in the series so far, can also be used to play through Swap Force content. If you're a parent of younger children, it's also something else for you to trip over.