Apple releases a week after beta three of OS X El Capitan 10.11.1 the next beta version for developers. It's about the fourth beta of OS X El Capitan 10.11.1 for developers and has build 15B38b and is already available on the page developer website.
In addition to the developers, this beta four also reaches users who are in the public beta program. Apple continues at a good pace with the launch of these beta versions and polishing the details for the launch of the official version that is expected to arrive together with the new iOS 9.1 later this month.
We can always find minor bugs or some unforeseen in beta versions and for this reason we do not tire of advising that as far as possible these versions are not used as the main operating system to avoid problems or incompatibility with any application or tool that we need to work in our day to day. Obviously these versions are usually very stable and there are no outstanding problems with them, but we can avoid their use as the main operating system on our Mac and use them on a partition or Mac other than the one that works better.