Well, I haven't heard too much discussion regarding MMX at this point.
I've spoken with some of the people here who are most affected by that
issue and the overriding sentiment is that our game has limited areas where
MMX would be large improvement. Although, there are some areas we are
exploring for the performance benefits. Our system requirements currently
do not include MMX, so any strategy we have will be one of mostly
incidental benefits.
As far as Rendition goes, we have plans to native implementations, but our
strategy is allowing us the possibility of using Direct3D if it becomes
worthwhile. We are kind of holding our breaths and waiting to see which
way the market will go with respect to 3D accelerator cards. Most graphics
people here, in my estimation, tend to prefer OpenGL more than Direct3D.
But our support for native Rendition (or other cards) isn't gone, we're
just being choosy about where we spend our time/effort.