There are only 11 members so far, and Frozen composer Robert Lopez may become the 12th, if he wins an Academy Award for "Let It Go." (The song was nominated for a Golden Globe, but did not win.)
Lopez won a Tony in 2004 for best original score for Avenue Q, and has two Daytime Emmy Awards (in 2008 and 2010, for outstanding achievement in music direction and composition) for The Wonder Pets. Most recently, he won two Tonys (best book of a musical and best original score) in 2011 and a Grammy (best musical theater album, 2012) for The Book of Mormon.
However, there is controversy surrounding EGOT membership: Liza Minelli, James Earl Jones and Barbra Streisand have also won all four major awards, though one was "special or honorary in nature" and therefore does not qualify. And some people believe Daytime Emmys shouldn't count, either, which would disqualify Goldberg and Lopez.
We don't even think the Skull and Bones' membership qualifications are this intense.