It appears that the PSVita version of Little Big Planet will be arriving earlier than expected. Eric Levine, SCEA PR Manager, posted the following.
Hi everyone – production on LittleBigPlanet PlayStation Vita was completed earlier than expected, and due to the excitement from our retail partners, some have decided to put it on shelves as soon as the product was received. You’ll still be able to fully enjoy all the offline features of the game, but the servers will not go live until September 18th. We apologize for any confusion this may cause and will keep you posted on any further updates.