Gamereactor just got confirmation from Little Big Planet's community manager, Steven Isbel, that Little Big Planet 3, which was announced on stage during Sony's E3 presser, will be available on PS3, in addition to the version that was announced for PlayStation 4.
"LittleBigPlanet 3 will also be coming to PlayStation 3," Isbel told us. "We don't have an ETA on any further announcements just yet but we will have more news on this later."
"However I can confirm that any levels created on PlayStation 4 will be able to be played on LittleBigPlanet 3 for PS3. (And vice-versa.)"
You can see the announcement trailer for LBP3 below.