I'd be surprised if it comes in much less than 3GB.
I had never played a LBT title before downloading the PSP version last week, and unfortunately missed the Beta. Creative is rather difficult, but playing it is great fun, from what I understand the Vita version's creation mode is much easier to use. Really looking forward to it.
the psp version is not really like the psvita and ps3 versions, the psvita version is practically the same graphics as ps3 and has more tools, although the psp game is good, i just wish they release the game now! hehe!