I received some of the books I had on pre-pub yesterday (12/19)--specifically the Elisha Collection and the Ecclesiastes Collection--in Logos on my Mac. I had assumed these would show up in Logos on my iPad, but was surprised to not find them. The public domain work on mythology also released on the same day does appear.
As I said, I was surprised as I thought had read numerous times that all new book contracts had mobile usage included. If new books are not going to be available in iOS, maybe we could get some kind of heads up at the pre-pub stage.