Some very interesting musings at Marathon's Story today, making observations and drawing connections between the language symbols seen in the E3 movie. Hamish is spot on, as usual, and poses some interesting theories, like this one:

The Covenant have encountered the technology of the builders before and have adopted (stolen) their language or place enough significance on their ancient symbols to wear them (possibly with reverence);

Some thought provoking stuff there... wonderful how a game this far from release can actually make a person sit and think like this.