Probably not, but there's one for Nintendo DS.
As far as I know, no they are not making a game. There is a Nintendo DS game Percy Jackson - The Lightning Thief that was released on February 9, 2010
No it is not expect to be released on the PSP when it is released in November 2011
No, Grand Theft Auto 5 was never released for PSP.
The new PSP (PSP Go) Will be released on 1st October 2009 and will be the price as the PSP 1000 on it's realese day, $249.99.
n-game? I'm not sure what n-game is, but this answer has been added in the year 2010. Sense we're in 2010, and the PS3 has been released, the PSP is going out of style. With the PSP going out of style slowly, (Note: games are still being released for the PSP) we may as well move on to the next generation of technology.
It was released on PSP
NHL 08 was released in mid-September of 2007. It was made for PlayStation 3, PlayStations 2, Xbox 360, and Microsoft Windows. It was never released for the PSP platform.
It will not be released for PSP
no there is not going to be a psp 4000
No, it will be released on the PSVita, but not the regular PSP line.
No; as of August 2012, the Sony PSP-3000 is not new. It has been succeeded by the PSP Go (PSP-N1000), released in October 2009, the PSP-E1000, released in October 2011, and the PlayStation Vita, released in December 2011.