It seems and is most likely that Mambo CMS will face a new begin of development cycle as the Mambo Open Source Development Team has just broke their relationship with Miro, the main sponsor. You can read the development team’s letter to the community over here.
I personally will support this action and join the new development of Mambo. The problem is now, we still don’t know yet whether the ‘new’ Mambo will be still the same as the ‘old’ Mambo or will be re-structured to align the new vision. But anyhow, it won’t matter much. One thing that does matter is to keep Mambo free and open source. Long-lived freedom!