http://www.gamespot.com/psp/driving/wipeout/preview_6115747.html
The game will contain a variety of modes, but only two single-player modes were on display. The single race mode is as obvious as it sounds, placing you on one of the game's tracks and challenging you to race against PSP-controlled opponents. Zone mode puts you on a short track and progressively speeds you up as you race. The only opponent here is the track itself, as too many collisions into the track walls will cause your vehicle to explode. The game will contain 16 tracks in all, including a class of tracks that appeared to be some retooled courses from previous games in the series. Up to eight players will be able to complete against each other via the PSP's wireless network support.
Wipeout Pure will also have hooks in place to add additional content via the memory stick slot. Downloadable content, such as new tracks, vehicles, skins, and music, will likely be made available at some point after the game's release. Details on how users will actually get this content aren't available at this time, but it will probably either entail downloading the files on a PC and transferring them to a memory stick manually or using the PSP near a wireless access point and accessing the Internet directly from the device.