Hi Welcome to DUC.
Avid is not good about providing roadmaps/future information. Folks here either have no idea, or if they work for Avid and do know they are unlikely to say. On the positive side were happily surprised by driver updates in April of this year.
The Eleven Rack makes a great outboard box, so with a suitable interface (ideally with S/PDIF or AES/EBU digital out and in) the box will work on M1 independent of any Eleven Rack drivers. And if folks don't think they are useful as a outboard box without being an interface, I'll happily make an offer for their "useless" box