Sohail_Tariq
Thanks for the explanations. Store application was auto updated tonight, right shortly before I started to log a support ticket. 
Great good looking stuff and a long desired refresh!! (I like "front row"!!)
Keep it up!!!
"web app version is not exposed to customers": But this would be great it could be seen somewhere, perhaps on the AdminCenter for a running or finished call/meeting. I think it makes fewer sense on the MTR itself, becaue it could change beween to meetings, if I understand correctly.
I think confusion for me (in the last few month) was coming from this article:
https://docs.microsoft.com/en-us/microsoftteams/rooms/rooms-release-notehttps://docs.microsoft.com/en-us/microsoftteams/rooms/rooms-release-note
Now a long time there "Teams Web-Client release" was the in first position of the table. So I thougt my MTR is not up to date. More confusing was that in the table it seems that the "Teams Web-Client release" is rolled out through Store (nightly reboot) because there is a collum "Published to Microsoft Store"
and the "Teams Web-Client release" phrase was't absolote clear for me, now it is.
Now the documententation was changed and the "Teams Web-client updates happen via the Teams web app delivery...." was added. This clarifies the situation (I read it first time while I was typing this comment).
As input to you, if it follows a seperate Versioning, and a different deployment/delivery methods it would be great if there where two separate Tables.
Thanks from Germany