Thanks. I had a read and found it interesting. Does look like they will concentrate on Firebird/Thunderbird and likely let Mozilla "suite" eventually be replaced by them, but I find this interesting:
We are not trying to stop volunteers and companies from developing the XPFE-based browser. Several companies have shipped and will ship products based on this venerable component of the application suite, and on the entire suite. However, we intend to focus on switching to separate applications based on the new application architecture. Therefore it is quite possible that the XPFE-based browser may bit-rot fairly quickly, so that the 1.4 branch contains its only working form. If enough contributors sign up to keep the XPFE-based browser working, mozilla.org will consider supporting that browser on the trunk beyond 1.4. However, it's not clear that we will have all the tinderbox and other resources needed to keep two different toolkit-based browser applications well-tested. We request that those companies and organizations shipping products based on Mozilla-the-application-suite let us know their plans in light of this new proposed roadmap.
So it is not absolutely clear what the future of the suite is. It is also not absolutely clear what the future of Camino is given Brad's earlier post. They do suggest that the Firebird project is not intended to depreciate Camino:
We are not deprecating XUL in favor of front ends based on native GUI toolkits. Nor are we deprecating Camino, Mozilla's Gecko-based browser that has a native OS X front end. Both approaches have their wins, and their loyal fans. The Mozilla community has embraced both approaches (even producing a version of Phoenix for OS X that tests well).
I might just download Camino and Firebird just out of curiosity, even if I don't really have the computer expertise to be a beta-tester. I am assuming that they will not screw up my machine generally.