From the Deadline article:
"Exhibition, no need to be alarmed: This has nothing to do with a change in distribution strategy for these films, I’m informed. There’s no Disney+ theatrical day-and-date going on, nor are Disney execs immediately concerned about the future of the global marketplace. It’s all on account of a domino effect going on with production and filmmakers. Some titles are contending with finishing scenarios while others are in production. This is how Disney is solving it, and when you come to think of it, most of the dates were already reserved by the studio for Marvel fare; they’re just moving titles from one slot to the next."