This is the first public release for the 1.2 branch. This is the result of a year of work of a growing team and contains a huge number of new features and improvements. The version is tagged beta1 because it will be a way to get some feedback about the new features before the real 1.2.0 release. We use and test this version regularly, but it's just too difficult to cover all use cases, so we cannot mark this version as stable yet. See the main release article on siril.org.