The original idea was that we would release 1.x builds more frequently (about once a month) by just picking out a daily build, but later based on user feedback we found out that users prefer more stable builds instead of faster turnover. So we decreased the frequency in favor of stability and more features. Usual daily builds are still available though for early adopters.
We are currently finishing 1.4, which will have a LOT new features. It will be released in about a month.