[nemeth88]

I think this will have a lot of difficulty remaining faithful to spirit of the original book series.

The original Foundation Trilogy stories take place across quite a few time periods. This would require a different cast for each story within the books. The stories are also focused on dialogue and characterization plays a minor role. Even the space battles are barely described at all, as the main focus of the book is on the broad plot lines created by the concept of psychohistory. There are few female characters and I don't recall any sex in the original series at all (though there was some in the weaker 4th and 5th novels written decades later).

If they are going to try to make this into a typical HBO show I'd expect the main focus to be on the Mule plotline from book 2, the second foundation plotline from book 3, and then the Trevize plot from books 4 and 5 which seems most amenable to TV adaptation.