Sorry I don't understand the announcement. You have always been able to connect a Sonos box into a Meridian system and have the M system as a Sonos zone. What's different here?

Audio: DSP8000SE upgrade, MC200, 818v3, Tidal, Bluesound
12 Bluesound zones, 1 Sonos zone, Roon
Movie1: Sony VW-790ES, 145” screen, Pan DMP-UB900, Oppo BDP-105D, Denon AVRX7200, Artcoustic Spitfire Subs, SL 8-4 (fronts) , SL4-2 (rears/sides), SL4-2 (4 ceiling)