NO returning aliens... as in 100%?

So in the initial email (or was it the PDF?) to Founders members, there was mention that Paul didn't want you to use the Ur-Quan in the reboot because he had plans to one day return to them.  Fair enough.  But since I joined the forum, I've been reading that at some point it was decided that none of the original races would be included in the reboot.

Was there something I missed where Fred Ford changed his mind and decided that he didn't want any of his intellectual property to be touched?  Does this project not have his blessing anymore?

I can easily imagine a scenario in which the storyline could enter into an alternate dimension with new alien races to discover.  However, I imagine that at least some of the original races would be necessary to bridge the gap in the storyline.  The humans weren't elevated to interstellar space flight until their encounter with the Chenjesu, so at the very least, the Chenjesu (and I imagine the Androsynth) should be present in the prequel/reboot.  I don't think there needs to be a great deal of interaction with all of the Alliance or Hierarchy races, but it seems reasonable to include at least a handful of them before the setting shifts.