According to The Portland Business Journal, Powell's Books, based in Portland, made the purchase:
Powell’s has begun marketing the books online (http://www.powells.com/section/from-the-library-of-anne-rice/) and, after a spell, will distribute the titles to its stores for retail sales. The books will contain a sticker noting that they’re from Rice’s personal collection.The books don't seem to be terribly overpriced (at least that's the case with the ones on the first page of the link, noted above) and it would be interesting to have one of the books Rice annotated. I might just do a little unplanned shopping in the next day or so.
Rice’s tastes apparently ran from philosophy film history to metaphysics and theology. Many of the books are either signed by or annotated by Rice herself.