"Good afternoon from Andrew! Today’s Kickstarter update is a demo of some graphics tech. And it’s pretty neat, but more importantly it’s necessary. I want to talk a little about why that is. There’s a lot of good engine tech out there, so why roll our own?
First, to make something clear: We’re not going doing everything completely from scratch from the ground up! That’s would be, to put it mildly, suicidal. We’re using someone else’s physics engine. We’re using huge chunks of some very familiar open source for our UI. We’re using some industry-standard networking that allow us to run some well-known programs as part of our stack. We’re still evaluating our audio middleware, but we’re definitely using middleware."
Continue reading here, video of their engine is down a ways on the page.