I am able to choose both Riviera and Grand Floridian Magic bands. Stay is 7/26 at Pop. I do not think that means they will move me to Grand Floridian. I think it just means anyone can upgrade their magic band to a given number of bands.
That is correct. Long before WDW was ever shut down, they would put resort-specific MB's in the upgraded inventory for anyone to select (the RIV one was available quite a bit last year and early this year). It didn't matter where you were staying - you could still purchase a resort-specific MB in the inventory regardless of where you are staying. Resort-specific MBs being available now give zero indication of what resort you are staying in or where you will be moved (if they move you).
40 days until we go, and I feel like I can't let myself be excited about it. I know you've got a lot on your plate Disney, but throw us peasants a bone! I can be patient about everything else, I promise! Just let me know I'm going!