Just received this schedule for the X1 (Xcalibur platform) roll-out from someone that's supposed to be involved with the project (not sure how reliable this might be, though):
Greater Boston area on May 1 (RNG-150 on June 30)
Atlanta and Chattanooga on July 31
Denver on August 15
Beltway and Freedom Region areas on September 11
We'll have to see if these dates actually do hold up, or will be slipped as usual.