Too bad there's no available manual on the 872 or 972 to check, but SN often packs a lot of features into their units...you can hope. However, for both of these features the only comparably priced unit out there is the Denon 3808ci. I think Yamaha's heigher end receivers have 2nd zone remotes that allow radio tuning.

Not sure how SN intends to implement, but some receivers (Pioneer comes to mind) allow digital in zone 3, however it's a passthrough of the optical input, so zone 3 requiures another DAC anyway.