Allegro 4.2.0 and AllegroGL 0.4.0 have been released recently. And I'm still a developer of both. I started working again on Allegro 4.3 recently, got a dummy driver working, which opens multiple, resizeable windows under X11. Of course, that's only a tiny step - the big step will be actually finishing such a driver, then integrating it into the main code, and also get drivers for other platforms.