April 1st, 2008 will see the R1 releases of The Time Warrior and Planet of Evil. Both titles are expected to sell for $24.95 each, and I believe they will have the same extras as their R2 counterparts.
Steve Manfred notes that this is the first time they've released DVDs in consecutive months at this time of year, and is a part of the general increase in the release rate of classic series titles in the Americas.
All I have to say is, it's about time! ;)