@IceCat Sorry for the slow reply and welcome to the Sonos Community. We are unable to discuss the road map of any new Sonos products and/or features. We can add your voice to the others who have also brought this feature request to our engineers attention. Please know that is feedback from users like yourself who help bring about new features on Sonos for a better user experience.  

Please add my voice too. 
drop in is probably the #1 feature we use (in a cell phone world - an intercom is very important). 
If I had known that this feature was not supported I would not have bought the Sonos One. 
Please fix this ASAP. 
Thank you for your great products!!

Randall Bone