well, i was going on the fact that the constants are called things like ENABLE_OPENGL_4X_SMOOTH and ENABLE_DEPTH_SORT which implies that the default is that these things are disabled.
however, i hadn't seen:
hint(DISABLE_OPENGL_2X_SMOOTH) - In Processing 1.0, Processing always enables 2x smoothing when the OpenGL renderer is used.
so it appears that 2x anti-aliasing is used by default.
http://processing.org/reference/hint_.htmlis there documentation / code for version 2 anywhere? i haven't switched yet...