Just thought I should let everyone know that I'm having issues with iTunes recognizing my iPod shuffle - 2nd generation with the first beta of El Capitan - not sure if current gen iPods are also affected
I've found that anything not running iOS like my 7th gen iPod Nano and iPod Classic are not syncing. Everything else is fine, including my 1st gen iPhone. Apple included this in their known bugs list, so hopefully by the third beta they'll fix it.