Fusebox 4 has developed in two different forms, Fusebox 4 with XML (FB4) and Fusebox MX with CFCs (FBMX). Both forms adds new features and serve different purposes. FB4 puts the logic and control of the application into XML, replacing the fbxSwitch file with an enhanced equivalent in XML and allowing the programmer to write their "fuses" in any language they choose. This makes Fusebox a methodology completely independent of any language. FBMX is a form of Fusebox that leverages CFCs to explore what Fusebox could become and how well Fusebox and CFCs can work together.
FB4 also includes many ideas from FuseQ, the version of Fusebox written by John Quarto-vonTivadar that allows for multiple fuseactions and streamed output into CSS and Flash front ends.
If you couldn't make it to Atlanta, you can view the presentation on CD, courtesy of Adam Howitt of the Atlanta ColdFusion User Group, for a $10 donation. Anyone who wants a copy should email him at adamhowitt@yahoo.com with the subject "Fusebox CD." And to get a deeper understanding, you might want to attend the four talks on Fusebox 4 that will be given at CFUN-03. The speakers include Hal Helms, Jeff Peters, John Quarto-vonTivadar and Sandra Clark. For more information see http://www.cfconf.org/cfun-03/.
Meanwhile, you can download the Fusebox 4 core files and documentation and find out more at http://beta.fusebox.org. Enjoy!