Next Google Update?
 

Sorry, my question might be dumb, but any idea when will be the next Google update? I'm especially concerned by a Penguin algorithm update: i filed a disavow tool file and I'd like that file to be taken into account and go back the right place in the ranking.
So, although I know they never disclosed this info beforehands, based on the past months or years, when could we expect a new update?