What we know about this is that there was quite a serious anomaly in the firing of the CST launch abort engines (I think there was a major leak of hypergolic fuel after shutdown). This was in June. Boeing at the time said it had addressed the issue. Unless it's another thing that is obviously much more of an issue.
Yep, they're going to use it as a cargo type mission but mainly its proving it in a complete CRS mission lifecycle, including (and its a big one) the automated docking system. The Soyuz-FG returning to flight with the recent Progress mission was important, as it would mean that the next Soyuz crew could go up, and thus there are people on the station ready to supervise the Crew Dragon docking and take over if necessary.
Updated the OP a bit. Latest BFR/Starliner info, old F9 models retired, deleted the launch/landing/failure counts cos I can't be bothered updating them all the time (and hadn't since May anyway!)
Launch today at 18:30 UTC (local time) is SSO-A, a rideshare mission for 64 (sixty four!) small satellites into a sun-synchronous orbit (one where the sun is in the same position relative to the ground, each time the satellite passes over). It will be the *third* flight for this particular booster. Live stream here:
Well, era was all sorts of broken during the launch, but everything went perfectly. That booster has now launched from all three of SpaceX's launch sites. It was their 64th launch and their 32nd landing.
Looks like they pulled them out fast enough that Musk says they can reuse them. I'm not saying they will reuse them, only that Musk thinks they look good. Maybe they didn't get any water on the inside of the fairings?