May 2012 edit: Rest in peace, MCA. Sometimes, you do stop.
Adam 'MCA' Yaunch has cancer. As you see in this clip, he seems pretty sanguine about it all. The worst news for Beastie Boys fans is that the album will be delayed. The worst news for Adam is he faces cancer treatment, which is pretty yucky.
In true Beastie style, King Ad-Rock thanks MCA for the opportunity to free up some spare time. Nice.