Do you need one... ;-) ?
When there were bugs fixed or there was new functionality need, there were in the passed very quick new builds.
After launching build 4408 I did not found any new important bug any more (I can assure you: that is unique).
However, I found a very little bug yesterday. Did not report it yet to Cardbox.
However, of course I cannot say when and if there will be a new build. I can only tell you what was happening in the passed.
What in future will happen, that only Cardboss can tell. However, I think he has told it us already.