I think it makes sense, contrary to LBP developer, Media Molecule, considering the tools that could be made available to you with a full sequel aren’t exactly things I would consider DLC. The fact of the matter is, everyone should have access to content, whether or not they have an internet connection for additional content. I’m not saying that not having access to extra content would render LBP unplayable or less fun, but as a developer, it is important to make everyone happy, if possible.
And so you start with a very cohesive community and then you have not. So certain features you have to do in a sequel so that you can reset the playing field, and make all these great features that you worked so hard to put in the game accessible to the largest number of players possible."
No release date has been set yet for LittleBigPlanet 2.
Source: CVG