When the PlayStation Store updates today, you'll be able to purchase the new Cross-Controller Pack and Marvel Heroes Costume Packs for LittleBigPlanet 2.
The former item is particularly interesting, as it lets you use the PlayStation Vita as a controller when toying around with the new user creation tools. It also contains new levels for good measure.
The new goods are available download (but not purchase) now -- better get on it, as they're over 1GB in size. Included in the DLC is new, yet to be detailed content set to launch in the new year.