Latest CU for Skype for Business out. Moves version to 6.0.9319.235

 Following components updated:

•  Performance Counters
•  Response Group Service
•  Conferencing Attendant
•  Web Components Server
•  Front End server and Edge server
•  Core Components

Noted Additions, Fixes and Updates:
Adds the Active Directory Authentication Library (ADAL) feature to Microsoft Skype for Business Server 2015.
https://technet.microsoft.com/en-us/library/mt710548.aspx

Windows 10 users who use Edge can't join a meeting from Skype for Business Web App
https://support.microsoft.com/en-us/kb/3095143

The Response Group service crashes when you change the value in the dbo.Agents table
https://support.microsoft.com/en-us/kb/3141112

An improvement to allow PSTN callers to join a Skype for Business meeting without a PIN.
https://support.microsoft.com/en-us/kb/3141121

You can't join a meeting from outside Lync 2013, Lync 2010, or Skype for Business on iOS 9.2 and later.
https://support.microsoft.com/en-us/kb/3126487

Server-side conversation history in branch site deployments is no longer supported in the March 2016 cumulative update.
https://technet.microsoft.com/en-us/library/gg398217(v=ocs.15).aspx (no further information at this URL)

Call transfer from a PSTN call to a federated user fails in Skype for Business Server 2015
https://support.microsoft.com/en-us/kb/3141120

Event 1000 occurs and the Rtcsrv.exe process crashes on a Skype for Business Server 2015 Front End server
https://support.microsoft.com/en-us/kb/3141114

Event ID 47067 and the HTTP stack goes into Overflow in Skype for Business Server 2015
https://support.microsoft.com/en-us/kb/3141123

Debug-CsInterPoolReplication returns "BATCHES OUT OF SYNC" error in Skype for Business Server 2015
https://support.microsoft.com/en-us/kb/3141122

Tab key expansion process returns non-relevant parameters to Shared Line Appearance cmdlets
https://support.microsoft.com/en-us/kb/3141119

"Endpoint failed to login" error when you run SLA-related cmdlets more than 20 times in Skype for Business Server 2015
https://support.microsoft.com/en-us/kb/3141118

Delegate data is not removed when you run the Remove-CsSlaDelegates cmdlet in Skype for Business Server 2015
https://support.microsoft.com/en-us/kb/3141117

ADFS 3.0 is supported for OAuth tokens in Skype for Business Server 2015
https://support.microsoft.com/en-us/kb/3141115

Can't prepare an Active Directory forest in Skype for Business Server 2015
https://support.microsoft.com/en-us/kb/3141110


Looks like the only database with an update is rtcxds:
https://blogs.technet.microsoft.com/dodeitte/2015/05/10/how-to-verify-if-skype-for-business-server-2015-database-updates-completed-successfully/


Updated 22nd March
KB3141121 goes live.

Updated 31st March
All KB's live.