As you may already know Little Big Planet 2 has been delayed until January 2011. And the reason is that all Playstation 3 owners aren't connected to Playstation Network and therefore won't be able to update the game with patches. Therefore, Media Molecule needed a bit more time to perfect the game before release:
Media Molecule's Alex Evans told VG247 the following:
"Like Little Big Planet, we will be supporting the game with patches, updates and whatever, but you have to realise right from the beginning that there are those people who don't have online and that is why we decided it was the right decision to delay the game."