Thorough report from Randy Kennedy in the Times.
UPDATE: More from Holland Cotter: "[T]he [Corcoran] had limited exhibition space and could show only a fraction of its holdings of 17,000 works. Now nearly half of them are being absorbed into the National Gallery of Art. And maybe just as important, the remainder will be parceled out to other Washington-area museums, raising the chances that, with a little schlepping, we’ll eventually be able to see more of the Corcoran than we could when it was intact."