Marc's note: According to a tweet by NASA Spaceflight there was a micrometeoroid strike on the Cupola. According to the tweet it is minor impact and "doesn't look bad." The shutter was closed and impact is being evaluated. Details to follow when available.
Update: Cupola hit by minor MMOD strike, shutter closed for evaluations, NASA Spaceflight
"Window 2 on the Cupola module has been hit by a minor MicroMeteoroid and Orbital Debris (MMOD) strike. With the window's protective shutter closed, per flight rules, ISS managers are evaluating photos of the damage - downlinked from the International Space Station (ISS) - before they are expected to give the crew clearance to reopen the shutter."