Hello,
soon I will start preparing the 1.5.4 and 1.4.5. The only issue reported and not clarified yet is the tcp failover that I tried to reproduce today without luck, might be dependent of (triggered faster on) particular architecture. It can be fixed once gathering more details or being able to reproduce. If you are aware of something else, please report to devel list.
1.4.5 will mark the official support for 1.4.x series, although some fixes may go back there from time to time, but I don't think will be another release of that branch. I recommend to update to newer version or stick to svn for updates.
Cheers, Daniel