Lots of people have been asking about Mozilla's Composer app and what will happen to it in the new world. The roadmap says:
The other integrated components of the Mozilla application suite, Calendar, Chatzilla, and Composer (the HTML editor application), are not going away, either. We're not sure yet how they'll evolve -- whether they'll become standalone toolkit applications (and if so, based on which XUL toolkit), or popular add-ons to Phoenix (if so, they will need to use its new XUL toolkit). But we're committed to supporting them to the fullest extent required by their owners, including providing daily and milestone builds of them for community testing and feedback.
Well, Daniel Glazman posts at his blog today a future for composer where he explains what his goals would be as the Composer maintainer. I'm excited to see that people who are in a position to keep this great application moving forward are interested and passionate about doing so. I use Composer and look forward to the many improvements that it will gain in the new world.