Sony is still refining their psp strategy and exploring new distribution methods(downloads) and finding ways to combat piracy I believe it will be another 2 years until either reveal but I believe Sony would wait until TGS while Nintendo will go at E3.
Nintendo has perfected their DS strategy and will wait out its success a little bit longer the new handheld is probably ready to go but they had the same strategy as with the GBC and the GBA.
Sony is profiting on the psp not as much as nintendo and the psp is rising so they won'y want to kill it off quickly either just because they have so many possibilites to explore for the successor.







