We've been working on the rewrite for several months now, with little chance to actually use the features that we've developed for Code Golf answers. This release provides a legitimate way to use what's been implemented without actually making a 2.6 release. Therefore, this won't be very detailed in way of release note, and this is not signifying that the rewrite is done.
In order to consider the rewrite finished, all modifiers and digraphs need to be implemented and the YAML for the elements needs to be processed into tests and text files for quick reference.
But for now, enjoy the pre-release, and make sure to include the version in any answer headings.