The prerelease build released last Friday has been set live as the official version. The PatchVersion for all the games is 1765266.
Here are the change notes:
Source engine:
* Synced engine with latest changes from TF2.
* Improved network compression to reduce impact of network spikes.
* Added sv_netspike, sv_netspike_output, sv_netspike_sendtime_ms
* Fixed listen server creation dialog not showing maps in custom or downloads folder.
https://github.com/ValveSoftware/Source-1-Games/issues/252 * SDK tools are now shipped by default with the client. (There is no need to opt into the sdktools_beta branch.)
HL2:DM:
* Added VR support for Oculus Rift