There's been some requests for official information so here it is:
Kerberos have officially confirmed that a new build is being uploaded to Steam right now and Steam will automatically take care of the update.
Once it's up we'll confirm and also post the change-log.
So in summary: updated build and change log incoming.
Edit: We'd also like to apologies for the inconvenience and are very thankful for your support and patience. A lot of people are working hard right now to fix things so hopefully we'll have some more news soon.
Edit II: The latest update from the devs is that the build is still uploading but that they are seeing the light at the end of the tunnel and are in close communication with Steam.
Edit III: This just in from Kerberos: "Upload almost complete, short test, then live. Big thanks for being patient. You'll understand our caution we hope."