From my understanding it also handles large amounts of bricks better, and some other things. I guess the idea is to be Blockland but slightly more polished, in an engine that isn't Torque. And for years everyone has pretty much agreed that Torque isn't that great.
I'm sure my interest will skyrocket once modding support is added and someone adds the Blockhead player model/support. I honestly think the current model is pretty ugly, but I understand they're trying to be unique.