Wan bonding to achieve speeds higher than 940 mbps

So i currently have the gig plan. Received email saying its been increased to 1200mbps. I have a Motorola MB8600 modem that supports wan bonding to achieve higher than gig speeds. There are a few consumer routers from netgear and asus that also support wan bonding. Question is does Comcast support this? If i go ahead and bond the other wan port on my modem and purchase a wan bonding router...will i see the 1200 mbps? Does Comcast have to provision my modem for this to work or is this just not supported at all?