From what I'm seeing now PSP2 has few really strong points about it:
- all the developers were talking how easy it was to port games from PS3 - that means it will have massive library at startup (and yeah they will be ports but guess what - 3DS library is in huge part ports too).
- they seem to be going to push online gaming - they are like portable X360 here comparing to nintendo with friend codes
- they will have trophies and ps3 cross platform gaming - so they will be trying to expand PSP userbase with people who already have PS3
- monster hunter confirmed - that alone ensures solid initial sales in Japan
So imho it won't outsell 3DS but should get higher market share than PSP did.
PROUD MEMBER OF THE PSP RPG FAN CLUB







