Evidently for some there have been.
Personally, I'd wait for the 8th and see if there was another one offered then.
At a minimum, I think I would image my drive to make sure I had a strong fall back position, just in case.
I've done the update on both mine and my wife's computer with no ill effect, but.....
Some have reported other less favorable results.
Perhaps Google and KB3140743 may be more enlightening.