Basically, I want to perform some load-balancing for incoming transactions (oltp workload) to varying set of MySQL server.
I know that MySQL-proxy can provide simple load-balancing . I want to reconfigure the pool of MySQL servers dynamically. It seems that it is not yet available: "...it is on the list. We are working on a administration interface for that purpose." 
I wonder what is the status of this?
This feature is critical to my doctoral research.