I hope it is, I've been contacting my Avaya SE about it and he has various info about it that is from older power point presentations but nothing recent.
The presentations don't have much substance but basically sounds like you host the server/s and you sell the product through OneSource/EC/Whatever. When you sell an instance it will generate a license file. Meanwhile your server is pinging the Avaya Cloud and finds a new service activation and spins up a new instance with the license file. Then you manage it with Manager same as always. Users Types will be Telephone+VMwail, Telephone+Vmail+UC, Contact Center Agent, Contact Center Supervisor.
These presentations were from late 2014 and early 2015, since then I haven't heard a peep so no idea if this has all changed.