Looks like the PMDG 737 NGXu update as well as the highly anticipated expansion pack (600/700) have been delayed. You may recall, release was originally planned for today but things have shifted. According to Robert Randazzo, “Unfortunately, my schedule changed and I have been called out to fly a three-day trip.” As such, “it is likely we will simply hold until a week from Wednesday.”
Basically, not happening for this coming weekend.
Source: PMDG forums