OS X 10.11.1 beta 2 is making its way to developers. The new update is build number 15B22C and is 656 MB in size. Apple has not provided any change log for the updates.
The first OS X 10.11.1 beta had new emojis, including the middle finger one. Apart from that, not much else had changed.
The update can be downloaded from Apple Developer Center. If you already had OS X 10.11.1 beta 1 installed, check Mac App Store updates tab to download the update.
We will update this post if any new changes are found.