Regardless of what the project is, it wouldn’t be surprising if it helps to raise money for charity.
One cool possibility is that it’s a virtual table read among the cast members.
Many of the recent reunions were formed for good causes, and it’s easy to see the S.H.I.E.L.D. cast and crew taking a similar approach.
Not only that, but maybe they could be coming back together to do a read of an original episode written by showrunners and writers Jed Whedon and Maurissa Tancharoen.