The motorstorm time attack mode is now available in the PS3 store. I would hold out though because the update seems to make Motorstorm un-bootable. Looks like there will have to be a fix.
There is also a new Haze Trailer, Lair Trailer, Darkness Story Trailer, Super Stardust Trailer and Rampart.
Quite abit of an update to the store. Shame Motorstorm doesnt work though