I remember the plan was for another DLC that would take CMRT to the end of the war but it has been years waiting at this point. So now I'm just asking if there will be something like the vehicle pack, where we can finally get the Lend-Lease equipment, even without scenarios or campaigns to match.
That is the plan! In theory we can make it work and, obviously, we have incentive to make it work. However, until we get right into the thick of things we won't know for sure what, if any, limitations exist.
We don't own the content for CM:A and that pushes it way down on our priority list for updating because it would involve quite a bit of work with considerable risk the effort wouldn't be worth doing vs. putting the same time and resources into other stuff.
Shermans? Why not