ZDoom's SVN repository reached r2500 recently. Shortly after, ZDoom 2.5.0 is there, followed by GZDoom 1.5.0. The highlight is the new "MiniBSP" system which harnesses the internal nodebuilder to allow polyobjects to have any arbitrary shape, instead of being limited to convexity. They can also travel all around the map. But there are also many other important changes, such as non-compressed extended nodes (also supported by PrBoom+ and Eternity Engine), support for using Byte Map Fonts in mods, compatibility options allowing a gameplay much closer to vanilla, and a ton of other enhancement and bug fixes.