Chatted with tech support at FDT. Apparently, minor bug in the project template configuration files that will be fixed with an upcoming release.
Unsure where they are on non OSX platforms, but for the mac, they are in: ~/Library/Application Support/FDT/projectTemplates2/haxe/*/description.xml
Edit the files and change the 'version' tag from 2.7 to 2.8. Then relaunch FDT and the Haxe project templates will display.