We're currently proposing the inclusion of 12 extensions. Someone also proposed BlockArguments in the thread, but it hasn't found a champion to add it to the proposal (I won't be this champion, I find myself quite unable to argue for or against it).
This'd bring us to 59 of the ~130 extensions. Almost halfway there! (considering that some are deprecated or mere aliases, it's actually rather better than it looks).
Maybe I should add QualifiedDo, too. I like QualifiedDo, and I don't envision any change to it. Any thoughts on this one?