@mikeal issues list is where all of it done, one of the main contributors only exists on github in fact
e.g. next release has been outlined here: rvagg/nan#205 - will be released at the end of this week.
I've just made this issue for v2 discussions: rvagg/nan#208 - so far there's only one small breaking change that's slated for it (I just can't recall exactly what it is right now!) but I'm opening up discussion to more severe breakages.