The target dates published back in January were August & November 2018 for Boeing’s uncrewed & crewed flight test, and August & December 2018 for SpaceX’s flight tests. I don’t know what to read in to the fact that the latest target dates specify a month for both SpaceX flights but are less specific for both Boeing flights. At the CRS-15 pre-launch press conference, Kirk Shireman made clear that the old dates were vendor supplied target dates for them to work toward, but did not reflect NASA’s estimates of vehicle progress or ISS visiting vehicle scheduling which could affect actual launch dates. The new schedule still refers to them as target dates, but it is likely that those concerns are reflected in at least SpaceX’s November DM-1 date.

The Commercial Crew assignment announcement is about to happen (11:00 EST — and will be covered on NASA TV). Perhaps some more schedule information will be revealed.