I'm starting to feel sorry for anyone who buys a Metal Gear Solid title the first time it's released. It's a growing trend now to see each title re-released with new content - beginning with MGS: Twin Snakes, then MGS2: Substance, and recently MGS3: Subsistence. I'm guessing MGS4 will get the same treatment with a Sustenance sub-title. Or something.
As for the actual news meat of this article, well, the trend is continuing for Metal Gear Solid: Portable Ops. Today, the rather uninspired title of Portable Ops + was announced.
Destined for release in Japan on 20 September, the 'new' title will feature more stages and characters for online play, and another single-player storyline entitled "Infinity Mission". No word was given on an American or European release date, but it would be unlikely for the game not to travel west.