Hi all,
since there are many relatively serious bugs in Alpha 4, I will try to speed up the release of next (bugfixed) alpha as much as possible, that means it will be released after just 1 or 2 major features are added (probably IES lights and interactive rendering).
The development speed will be however somehow slowed down, because I also need to work on a business plan and do some negotiations with potential sponsors to finance full-blown commercial development.