Well, an obvious extension of the LEGO Video Game series is The Simpsons, but I’m not a huge fan of that license, personally. And I’m sure that’s already in the works.
I LOVE the LEGO games – finished 100%’ing The Hobbit on PlayStation 4 a few weeks ago and I’m in the midst of playing PotC on PS3 – so this is an exciting proposal. Imma think on it a bit.