I'm sure there are others in the mix besides Joel Friedman, but since I'd met him several times in distant years' past, he was most front of mind.
Here is another mention of him (spelled "Freedman") on JWN almost 10 years ago as being on the short list:
http://www.jehovahs-witness.net/jw/friends/81709/1/Info-about-Governing-Body-required#.UysfefldUYo
A couple of 'anointed' COs--Tony Morris and Joel Freedman (sp?)--got pulled into Bethel within the last couple of years before I left the org. They had been COs for less than ten years at the time, so I'm not sure how much longer they'll have to serve before they're considered for the GB. There's got to be a lot of resentment among the upper echelons at Bethel about young COs getting promoted over their heads just because theyre 'anointed'.
From what I know, they're both pretty hard-line JWs, Freedman more so than Morris. And incidentally, I believe they're both in their 50's now, and received their 'anointings' in the 1970's.
There may be others being groomed, I just know about those two because my family is acquainted with them.
There was a "special" Memorial at an Assembly Hall recently where one of the GB was the speaker; Joel Friedman was also introduced as being from "World Headquarters" and said one of the bread/wine prayers. So, at some level, he's in the wings at Headquarters around the GB.
He's partaken for decades, is an excellent speaker, and comes across as very kind both in person and from stage. Interestingly enough, he only has 1 child, a daughter, who left the Org (maybe 20 years ago?) with her husband not too long after they got married.