Modification of Kendall Conrad's Zen-Coding plugin for BBEdit, uses BBEdit's new "package" format (available since version 10)
To install, simply look for a directory "Packages" inside your ~/Library/Application Support/BBedit/ directory, and copy the directory "zencoding_(version).bbpackage" there. If no "Packages" directory exists, create it first, then copy.
You can modify the zen_settings.py file as described on Kendall Conrad's site, only it's location has changed to ~/Library/Application Support/BBedit/Packages/zencoding_(version)/Contents/zencoding/ and in order to get to it you have to right-click the .bbpackage directory and use the "show contents" option, if you're in the finder.