Warhawk ready to fly on the PSP too?

A rumor about a PSP version of the Playstation 3 online exclusive, Warhawk, has been swirling around for quite sometime. The latest ESRB update gives it some substance because Warhawk has been re-rated as a PSP game too. Perhaps, Sony plans to release this as a downloadable game since the PC PlayStation Store is open. However, the PS3 version takes full advantage of Sixaxis motion control. If Warhawk is about to make a PSP debut, it's probably going to be modified hopefully with an offline single player mode too.

Update: Maybe not, Mark points out in the comments that this is probably a downloadable PsOne game instead of the Playstation 3 version. He's probably right about that since there are three ratings for Warhawk online.