Baby steps to be assured, but still steps. I received an email this morning from Autodesk (makers of AutoCad) stating that they will be releasing viewers and import/export tools later this fall. The announcement is available online at their site.
They are reiterating that they have not yet decided whether to move to the Macintosh for AutoCad (which had been available for the Mac years ago, but hasn't been for quite some time), but that all options are open and that they recognize the importance of the Macintosh as a publishing platform (although they aren't yet convinced on the design side).
Still, it's a step.