Here is a link to USDOJ Antitrust Chief Makan Delrahim's speech today in Palo Alto, California, announcing the withdrawal. Here is a copy of the Policy Statement, which is still available on the USPTO's website (but not the DOJ's), and here is backup copy I just made, in case it goes missing from USPTO's website.
I will have more to say about this before long. For now, Ill just say that I don't think the withdrawal is a good idea . . . .