That is very bad news announced by Jester on the forum se7ensins.
Indeed, although it is not a developer in the project freeBOOT, Jester is relatively close to the people composing the project team. Thus they have entrusted the project was finalized and there would be no new version to integrate Microsoft's new dashboard will happen in November.
Still according to Jester, the developers have taken this decision in finding that the main interest of users freeBOOT was hacking and cheating in games. Lack of project and homebrew on the Xbox 360 will be weighed in the balance.
Now that the project is stopped, this does not necessarily mean the end of rebooters on Xbox 360. The project freeBOOT being sufficiently functional, other developers did not see may be no point in embarking on the development of a new reboot ... thing that could now change.