For a list of changes in this release, please see Changelog for 4.1.0 Beta 4. If you are a style or language pack maintainer, please check here for changes which may affect you.
State of the Beta
As some people may be aware, we originally intended to only have 3 beta releases for 4.1.x; however, due to last month's down time, we released an unpolished and unannounced Beta 3 beforehand in order to tide folks over.But as the number of unresolved issues in the bug tracker approaches that of typical stable releases, and with only 1 more planned feature to roll out in 4.1.x, we fully expect that the next release will be proposed as stable -- that is, a Release Candidate.