Microsoft Exchange 2016 and OwaVersion:Exchange2013

During the study of Exchange 2016 RTM I noticed one thing - "OwaVersion" of OWA Virtual Directory is "Exchange2013". CU1 - CU14 still no changed it.

[PS] C:\Windows\system32>Get-ExchangeServer | fl AdminDisplayVersion
AdminDisplayVersion : Version 15.1 (Build 466.34)

[PS] C:\Windows\system32>Get-OwaVirtualDirectory | fl OWAVersion
OwaVersion : Exchange2013