Email notification for missed calls... is this available?

Is there a feature in the latest versions of FreePBX that can send emails to users who have missed a call?

No. You would have to write one because only you can figure out what you consider a missed call. I mean do you want all the members of a ring group to get a missed call alert even though the call was picked up by someone else in the group? Are you talking specific missed calls to extensions?