From what I've been able to glean from the various press reports and technical sites, CFast 2.0 has a theoretical maximum speed of 600MB/s (same as the so-called SATA 6; 4000X for you CF users). The cards are the same physical size as CF. They use the standard SATA connector for data, but a different connector for power.
XQD 2.0 has a theoretical maximum speed of 1GB/s (~6700X). The cards are smaller than CF.
Since Nikon put XQD in their D4, you could hear crickets in the XQD market space until Lexar announced their 1100X XQD card this year.
Personally, I wouldn't put a whole lot of stock behind which memory manufacturer is aligning with which specification. They will adapt quickly to the market. The game will be decided by the manufacturers responding to consumers.
But, on that front, it is interesting that Sony has not yet put XQD in any of their cameras!

