Alpha 4 is on the forge now. I decided to release it as soon as possible, due to eventual problems with programmer (which was not updated on last images, might require you to build your own).
Also a bug related to how compiler handles 64-bit values was fixed: again, it might break some computations, like baud rates, delays, and others.
I don't think win32 port will be ready by then, but other features will make it. The most prominent one is a new interrupt controller, and two external interrupt lines you can use (edge-triggered, high or low level, using PPS). Auto-cleanup of interrupt is also working for the latter, you still need to clear interrupt bits for internal devices for now.