Really nothing different technically from what I can tell at a glance (it's still a craptastic mesh network). But what I thought was cool was that you can use just about any existing Asus router as a mesh device. Just a simple firmware update to get the feature, and then it's all GUI driven to set up the mesh network.
They show the RT-68U as one of the routers which I know lots of people have used on here.
So yeah, just worth a thought I guess if you want (for some bizarre reasom) to do a mesh network, this could be a cheap option!