After the update there are currently 3 unresolved issues:

Voice Chat
Matchmaking
NAT Type Detection- what was set to Open is now set to Moderate or Strict and can't be manually changed. Problems: Can't join friends online. Can't chat with friends online. May not show friends online but they are. 

The team is aware of these issues and is currently working on them. They have no timeframe except ASAP! 
The suggestion is too not change any port information, nor to change router settings, etc. (Do not change anything to your current setup.)

This was posted on Major Nelsons Blog: A small number of people are having issues with incorrect NAT type detection. The team is aware and working hard to resolve it as quickly as possible.

HB