cPanel just announced a number of changes in the new 11.23 version. The biggest change for my needs is the smaller memory footprint. They are claiming 60% less memory usage. This will really help me a ton as PHP/MySQL sites can eat up some ram. I also like to run as many sites as I can on one server to reduce my overhead costs.
Check out all the details here: http://blog.cpanel.net/?p=51
This update is a RELEASE version. It is not currently in the STABLE update tree.