Disneyland CMs are currently wearing masks all around the resort at DTD and the Touch of Disney dining event. CMs I know have also reported they are being given masks and, if they are to be in close proximity to a guest, face shields for protection. So this information is incorrect.
Definitely not new. I did the Southern California Backstage Magic Tour in January 2016 and we toured Imagineering then. From what I can tell, this is a shortened version of that tour without Muppet Studios and the Train Barn.
Flights of Wonder replacement is the announcement for today!