Good news for all those GZDoom fanatics out there: The new version 3.3 has been released just a few days ago and it brings a huge list of additions and improvements to the engine, especially some ZScript and UDMF Mapping highlights for you, for example dynamic spot lights configurable in the UDMF map format or mod-defined aliases no longer permanently change CVARs. For a full list of changes and additions, check the release thread and get your copy of GZDoom 3.3 just now - it's worth every bit and byte.