I think the PS4 will struggle out of the gates in JP. There's NOTHING announced for it at launch that will make people wanna buy it. FFXV, MGSV are both 2014, KH3 is 2015 at the earliest, all are multiplatform titles with MGSV also being on PS3. GT6, LR, DS2 are for PS3. No niche or mid sized games announced for PS4. Dark Souls 2 and GT6 are rumored to be cross gen like MGSV, but that runs into the same problem the vita has with a lot of mp titles.
Right now, there's no PS4 exclusive game that appeals to the Japanese audience, all games that appeal to them are mp titles. There are no games announced at launch that appeal to the JP audience, all games that appeal to them are 2014 and beyond titles.
I think Sony is doing well by delaying the launch of the PS4 in Japan, to be honest.