Your brain doesn't hurt enough. Click here and try playing with a 4-dimensional rubik's cube. Ok, it's not actually 4d, it's a theoretical model, showing what it might look like if we could perceive another dimension. But it'll still hurt your brain.
I honestly would've been happy if they'd left the game exactly the same as the first, and just added original trilogy content. But they're actually fixing some of the camera issues, making vehicle levels more fun, letting you make your own custom Lego character (by jumbling up parts of existing characters), and--this is the best part--letting Lego Chewbacca pull people's arms out of their sockets as his special move! That's so cool! There'll be a few other changes as well...here's the full article. IGN says it's due out this fall. Woot!