This was posted on The Futon Critic today (from a press release ABC made on Monday):
With no word yet on renewal for the fifth season, plus this time slot change, could this be the end for Boston Legal? Or is ABC hoping a move for Women's Murder Club will boost its ratings?"Women's Murder Club" will return with original episodes on TUESDAY, APRIL 29 (10:00-11:00 p.m., ET), on the ABC Television Network. The one-hour series from James Patterson will air for three weeks in that time period.
"Boston Legal" will move to Wednesday night at 10:00 p.m., as of WEDNESDAY, APRIL 30 (10:00-11:00 p.m., ET), where it will air for three weeks, on April 30, May 14 and May 21, with a preemption for an ABC News special on May 7. "MEN IN TREES" will return on WEDNESDAY, MAY 28 (10:00-11:00 p.m., ET), following "Boston Legal's" run.