Knowledge Network first release candidate (RC0) is now available
Knowledge Network team just made available the first release candidate of KN with the following improvements:
Back-off functionality to improve the user experience when they are performing activities on their machines.
Various performance enhancements on both the client and server.
Improved keyword quality and generation.
An inner circle web parts that highlights people closest to you and who are most likely to assist with your query.
More info here.
A nice post with a KN usage example here.