I just read in VARIETY that Anjelica Huston has been signed for a six-episode arc on MEDIUM this year. She represents a company who hires Allison for some consulting work. The storyline is to continue to keep the series from lapsing into a predictable forumula.
Formula didn't bother me at all because the writing has been so excellent to usually keep the viewer off balance and not quite sure how the visions and dreams tie in together with what's actually happening. Also, now that Allison's secret is out, wouldn't that shake up the show, too?
Anyway, should be interesting episodes with these two actresses playing off one another.