Metal Gear Solid Portable Ops + preview at IGN.

"Last year, Konami released their first true step into the portable stealth action arena on the PSP with Metal Gear Solid: Portable Ops. Faster paced that the Acid games released on Sony's system, Portable Ops stretched the capabilities of the PSP to the limit thanks to its inclusion of Wi-Fi and peripheral support, and was one of the strongest games released last year. That experience is about to be extended in a few weeks, as Konami is readying their own expansion pack to the critically acclaimed title with Metal Gear Solid: Portable Ops +. We dusted off our fatigues, grabbed our gear and re-enlisted with Snake's army for one more tour of duty."

Full Source: IGN