If PS Vita improve and deleted psp laggs, then I'll buy it only for PD XD Otherwise, still too expensive D: (and i still don't know if the PS Vita in EU will work with the PSN store from japan, maybe they changed something ...) Well, the PSVita is out in Japan already XD Comes out in EU later ... February i think?
Yes, It came out on 17th December in Japan. Well, the PSVITA is not region locked so every game works on it. Plus you can use any PSN just like the PSP. In USA and EUR comes out on 22nd February, 2012.
Yes the PS Vita is already available here in Japan, but personally, I prefer the PSP since the buttons like X,O etc. are very small and the PS Vita is more heavy than the PSP. Regarding playing games on the PS Vita and soft: The new soft for PS Vita are like hmm~ I haven't seen anything interesting yet neither in the stores nor the PSN, but well let's wait. For playing PSP-UMDs you need to download and install the the "UMD passport" available for free on the Japanese PSN store - otherwise you won't be able to use them. That's true, you can use Japanese soft as well as American soft, etc on the PS Vita. So don't worry about this :3
Only difference I see that Vita's screen is bigger and brighter which is obvious becouse it's brand new console and PSP are several years old. If someone could record both with component/remotejoy we could see is there actually real difference :o