Certainly ASRock are the only ones to specifically point to XP941 compatibility in the marketing material they provided to thessdreview.com on page 2 of
this post.
We've got quite a few of the XP941's sold to customers with this board now, and expect to have some feedback from the early adopters soon on if the XP941 can be booted.
The other board of interest is the
ASUS Z97I Plus.
The marketing material says it's a dual SATA / PCIe 2.0 M.2 socket, but no mention of how many lanes. My guess is that it's PCIE 2.0 x2 at most like the Maximus VII Hero is.
Rod (Vendor rep for ramcity.com.au)