LittleBigPlanet HUB is an upcoming free-to-play PlayStation Store-Exclusive title for PlayStation 3. It was originally going to be released at the end of 2013, but has now been delayed. There hasn't been any news since it's announcement except a confirmation in 2014 via Twitter it was still in development.
Small sections of LittleBigPlanet and LittleBigPlanet 2's Story Modes will be available to HUB players - as well as a LittleBigPlanet HUB-exclusive Story Mode. LittleBigPlanet 2's Team Picks will also be available to play on LittleBigPlanet HUB, however it is not yet known whether players will be able to play other community levels from LittleBigPlanet or LittleBigPlanet 2, or whether LittleBigPlanet HUB will have a separate online server to the aforementioned titles.
Players will not need any of the previous LittleBigPlanet titles to be able to play LittleBigPlanet HUB, however, if a player has collected items from either LittleBigPlanet or LittleBigPlanet 2 they will be imported over to LittleBigPlanet HUB.
The game is most likely cancelled, as there has not been any confirmation that it is still in development. Instead, Sumo Digital are adding its features to LittleBigPlanet 3. Update 1.22 added the challenge option, but it is currently crossed out. It also added the Seaside Surprise Level Kit, which is supposed to be the free level that came with HUB.