What was that report that Japan leads the world now in spending on mobile apps with the no.1 app categorey being games?
You can see why pubs like Square-Enix and Capcom are jumping ship.
No ... sadly I don't think the PS4 will do much. The PS4 seems more Western-centric than the PS3 was even. There's not many Japanese devs left either that I think can make huge budget PS4 games.
They will be sticking to the 3DS or PS3 for a while in a lot of cases I think.
Even though I wouldn't have really thought it a year ago, I think some type of Nintendo phone, maybe even primarily for the Japanese market is coming. Perhaps a Playstation Phone (a real one) too.