sorry for the confusion on my last deleted reply. i saw an RFE on el capitan support and mistakenly thought it was for bigfix but on second look, it was not.
ive been seeing similar behavior to jdeangelis where the services are not showing up as running but the agent is checking in to the parent server and console.
in my tests, the services took awhile to start running and checking into the console. but after that, i was able to send tasks and fixlets, which so far have been successfully running, although most of them are basic ones. at least it gives some hope that we can use console actions to update the agents on macs running el capitan. the triggerclientui does not open still and says the services are not running, so there are definitely some issues still happening.