My comment was referring to the current API, to create tools with LUA.
This will most likely never happen. In fact, if there was time to develop something new, it would be a good idea to invest it in further boosting the tracker, improving the automation editor, and other details. Renoise still has bugs that need to be fixed as well.
On the other hand, there are LUA programmers with great programming capacity. If there was a better API for building more complex things people would be surprised. Renoise is a very powerful DAW thanks also to its API for building tools.