If you didn't get involved in the beta, then you can at least get in line for the real thing. Stores will soon be taking pre-orders for LBP on the Vita and it comes with a couple of neat virtual goodies. Offers vary by country so check out your local store site for the details.
Among them are Bioshock costumes, a knights and dragons theme and probably some more. The game is due out by October, don't have a firmer date than that.