From the post:
The theme of 1.6 is mainly about improving infrastructure and QA. These improvements include faster builds, moving from TC to Jenkins, and extending our tests to cover more client platforms, both browser and operating system wise. The reason for these changes is that, while we’ve delivered many great features very rapidly over the last few months, we’re always looking to do better. Improving our internal build infrastructure helps us deliver quality features faster, and helps us better turn around responses to the community’s requests for features.
Infrastructure isn’t our only focus for 1.6, however. We are also working on Neo4j so that we can store graph metadata, e.g. configuration settings. This will help us to better evolve the internal infrastructure.
As always, there are a number of bugs that have been fixed, both internally and for the community issues. See: https://github.com/neo4j/community/issues?sort=created&direction=desc&state=closed&page=1
Something to keep you busy over the holidays!