New info just added on IMDb. Alex Graves who is known for his work on Game of Thrones and The West Wing is listed as directing episodes 3, 4, and 5. I always though of Foundation and especially the Mayors era as being largely a political drama, so hopefully that's why they brought on Graves to direct these episodes.
On a side note, there's an Apple event coming up on April 20th. Maybe we'll get another trailer and/or official release date?