The show will broadcast from 2-4pm every Tuesday, starting on May 6th and running until May 27th.
That's about all the concrete information there is right now, but you can probably bet that it will be packed with unheard music from around the world and ages as well as brand new exclusive tracks. You'll have to wait and see whether he'll have guest mixes or if it'll be a solo ride. Make sure to tune in on the NTS site when the time comes.
Recently, Four Tet announced a bunch of new 12"s for his label, Text, including one from himself under his Percussions alias.