It looks like the Superhero Squad line is pretty much gone, however Hasbro plans on keeping the line alive through the movie properties, and this year, there will be a few new 3-Packs. Each pack is related back to its movie properties and release dates (May 1 for Thor, mid-May for Captain America).
-Iron Man, Detroit Steel, & War Machine
-Captain America, his motorcyle, & Hydra Agent
-Thor, Hulk, & Odin
-Thor, Loki, & Destroyer
-Thor, Sif, & Frost Giant