Well if you keep tabs on the forum you might of noticed that progress seems a little slow atm. With the release of beta 3 a month ago almost all the developers where working overtime to get things finished and sorted for it and this is where burn out effect comes in.
After working so long and hard on something you will often find the effort to keep going grows exponentially (http://en.wikipedia.org/wiki/Exponential_growth) and this is something im experiencing at the moment along with some of the other developers. Some times you need to keep pushing and you get over it however often the best method is take a short break.
We plan on releasing the 3.1.3 (yes the third revision) patch very soon and then alot of the devs (me included) will be taking a short break from development work to recover from the burn out. Dont worry to much, we arnt going any where and once we are back, we will be working hard to bring the next installment out.
(http://images.despair.com/products/demotivators/burnout.jpg)