At the closing bell, mortgage bonds are up, way up.  You should have already seen the first round of reprices from many lenders, more will be coming.

Unless tomorrow's economic news is bad for bonds (or positive for the economy in general, thus moving money out of bonds and into stocks), even better pricing will be available in tomorrow's rate sheet, especially for lenders that didn't reprice aggressively today.

Of course, that's contingent on unsurprising numbers on tomorrow's economic reports.  Locking tonight at the last possible moment is the absolute safest bet, but if you can afford it, floating is a risk worth taking.