at least kuaddro.com says so:
I don't know how accurate this site is but if there is only going to be one version. And it is going to be called the "5D-X" then so be it. For the reasons listed on that site. As long as we get the rumored "5D3" specs (e.g. 22MP, 61-pt AF, 6.x FPS and high native ISO (e.g. 100-12,800 or better yet...100-51,200 as in the 1D-X).
Hope we get some good news on March 2nd...or the night before (just before midnight).