We have just released rsyslog 6.1.0, the new v6-devel.
This is the first v6 release of rsyslog, beginning a new development focus. In v6, configuration shall become much more straigthforward. This release already offers action scoping, which keeps related things closer together. Other than that, it is roughly functionally equivalent to the latest v5 releases. However, there is imptcp available, a Linux-optimized plain tcp input which in theory should perform faster than imtcp (at the price of some reduced functionality).
Note that v6 requieres modifications to pre v6-plugins in order to work.
As always, feedback is appreciated.