I don't think it is even worth it. What sort of day-to-day applications use 20GBps as of right now (DDR3 speeds)?
I think that is a rumour which people have spread. I can't see it being true. Although, if it is true that they are using a custom AMD 8 core chip with an APU (possibly with a discrete card too, in hybrid CF?), then I can imagine it would benefit greatly from the increased bandwidth as I know that going from 1333MHz to 2400MHz on the RAM side of things already increases the 7660D (Trinity APU) performance by over 40% in almost all instances.