The cover may be Castlevania, but there's plenty of room for Skylanders.
http://www.nintendoworldreport.com/news/30417
The June issue of Nintendo Power features several new details concerning Skylanders: Giants.
The sequel includes 16 new characters, eight Giants and eight standard Skylanders. In addition, there are eight LightCore Skylanders (which light up, and have unique powers); four are first-generation Skylanders, and four are new, normal-size Skylanders. A LightCore version of Prism Break is the only confirmed LightCore character at this point, though the magazine will be revealing four new Skylanders in each issue until the game's release.
Other details include name changes for established characters (Tree Wrecks is now Tree Rex, for example), an increase in the level cap (from 10 to 15), and new upgrade paths.
Skylanders Giants is slated for release this fall on Wii and 3DS.