According to several publications
that can presumably read Kanji, Japanese tech-blog Impress watch
have confirmation via an official statement from Sony Computer Entertainment that manufacturing of the PSP Go device has been discontinued as they shift their focus towards the upcoming (and still without an official name) Next Generation Portable or NGP.
While the classic UMD disc-reading PSP-3000 model has managed to stay afloat in the incredibly competitive portable gaming scene, the PSP Go -- dependant solely on digitally distributed games -- never managed to carve its own place in the market (and at the price points they set
, we can't really say that we're surprised).
Sony's statement assures current PSP Go owners that firmware updates, repair processes and general support will all still continue, they just won't be making any more new devices.