Well, JJ just can't help but break, fix and break the proxy_balancer stuff again bless his heart.
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But that's not really the subject of this, it seems there has been a decent re-factor of the proxy_balancer stuff, and some new modules.
The new modules are;
mod_authn_socache
mod_reflector
mod_slotmem_plain
mod_slotmem_shm
Starting with mod_authn_socache, this one is going to affect everyone using mod_authn_dbd which allows you to use a database like MySQL for storing login credentials. By the sound of it, and the problems of having so many lookups flooding the authentication provider with requests for every single graphic, html & stylesheet file on a page, it sounds like a good idea to me! We will just have to find a good timeout value for it, heck, maybe that can become a future thread here.
On to mod_reflector, I haven't got a clue! I'm reading the docs for it but the dots are not connecting in my brain. I'm pretty sure it's Guenter's, care to explain it?

This leaves us with the slotmem modules, and for now the proxy_balancer stuff. These modules are simply for other modules to utilize and there is no configuration required for them. What all will become dependent on these modules we will just have to wait and see. As far as I know, currently only mod_proxy_balancer is, but looking at what they do I can see other modules possibly utilizing them.