Honestly, no idea (except I hadn't heard of Nexdock until now lol). Looks like they do the exact same things, but the Nexdock seems to have a slightly bigger internal battery. The only difference I can see is that this appears to be a little less expensive. Not sure what it'll actually sell for, but the "early bird" Kickstarter prices are between $119 and $139 while the Nexdock retails for $299. Beyond that, they seem to have the same features.

You'd think they'd do something differently or make some notable improvements since the product they're kickstarting already exists. My comment has some suggestions, lol. Maybe also including a serial terminal would be nice.