This distributed revision control system was released under the Apache 2.0 license on Monday. Linus Torvalds developed Git after BitKeeper's parent company (BitMover) announced the end of providing the software free to the community and associated obstacles. BitKeeper continues to be developed as they do still have a corporate following, but now they've finally gone ahead and made it open-source.
Bk-7.2ce is the name of the release that marks their first open-source release with the version being their "community edition" of the software. Compared to earlier BitKeeper releases, besides now being open-source, there is an upgraded TCL/Tk, some performance issues have been fixed, the BK/Web service has been improved to offer a better and more modern user-interface, and a variety of oher changes.
More details on this open-source version of BitKeeper can be found via BitKeeper.org.