Sony Europe has officially announced that Ridge Racer 2 will be coming to PSP before the end of 2006 (Q4, officially vague) which solidifies it being released worldwide this year. The game was announced in Japan last week, where it goes by the name Ridge Racers 2 instead and will be released there by Namco on September 14th.
The PSP Ridge Racer sequel introduces three new game modes and boasts a series-record number of 18 tracks, all based on courses in the home console Ridge Racer titles, but none of the tracks have been seen before on the PSP.
Even more screenshots can be found at Eurogamer.