User blog comment:Dopp/Technical Update: May 17, 2011/@comment-5926766-20110518063610/@comment-1656630-20110518203715

"So what is an "inactive" admin, someone who hasn't edited in X days or hasn't logged in in X days? "

Hasn't edited.

"Will admins receive an email or talk page message? "

Email. Though that can be disabled if the admin doesn't like those emails.

"an inactive admin is one who hasn't done anything on the wiki for 60 days. "

Actually, they're going to experiment with 30 days -- but only on small wikis that haven't had much activity. And admins will be warned at the 14 day and 27 day points that they're being inactive.

"Does it make the adopter and admin and bureaucrat? "

Yep. And it will de-bureaucrat the former one(s). But former admins will remain as admins.