Tate Publishing's website has been updated several times in the last few weeks. While it appears they do not have a back-up of their website available, you can still access portions of their website at the WayBack Machine.
There is no information yet as to how e-books, book sales, digital books, epk's or the speakers bureau are affected by their change yet.
Speakers Bureau - Styles are broken
EPK's - Missing
Digital Books - Missing
E-Book/E-Cards - Missing
Direct Book Sales - Missing