"Metal Gear Solid: Portable Ops is back, with new characters, new stages and new gameplay modes," begins our trailer, which pretty much sums it up.
Portable Opts is essentially an extended version of the already release Metal Gear Portable Ops, just with the word "Plus" in the title. Oh, and a bunch of new content, too.
There's a new single player mode, Infinity Mission, new soldier careers, and old Snake from the upcoming Metal Gear Solid 4 is now playable, although it looks like you'll need to unlock him first.
Anyway, the trailer explains it all so check it out, and the new screens below.