The second public alpha release of the
build2 toolchain is out and includes quite a few major features in the build system (high fidelity builds, command line configuration overrides), package manager (support for dropping no longer necessary packages), and repository web interface (ability to run multiple instances, look and feel customizations). See the Release Notes for a detailed discussion of these and other new features.
One cool thing about this release is that you can upgrade from the previous version via the package manager/cppget.org repository. Albeit via a bug-fix release for the package manager. Which some may argue makes it even cooler. What we are doing here is trying to figure out the whole backwards-compatibility game early and this stuff is hard. See the Release Announcement for upgrade instructions.