Hi all,
Based on a suggestion from Tim Hunt, I ran my automated performance tests on the "current" (as of this writing) 2.6dev pre-alpha code and also compared those numbers against the most recent supported Moodle releases: 2.4.6 and 2.5.2.
The results of that testing are on my blog, here http://jfilip.ca/2013/09/25/moodle-performance-testing-2-4-6-vs-2-5-2-vs-2-6dev/