Heh, I don't come on this board board very often, so I completely missed this.
Where did you hear that MacSoft was bringing CE to the Mac? I haven't been able to find anything on it.
Realistically the only option is to run Windows and get custom edition that way. WINE/CrossOver doesn't work well enough yet, in my experience. I only tried the free Halo trial with that, enough to know it wasn't worth exploring further. For me, it barely got to the menu and hung there. For other reasons, I eventually went the dual-boot route (Vista home premium) and got CE that way.