Eric Trautmann, who was responsible for editing the Halo novelizations and writing The Art of Halo, has noted on his blog a promotional comic he did for PD0:

I should add, Perfect Dark sucked countless hours of my life into a pixxelated void, never to return. Zero looks amazing. The game story (thus far) is pretty tight, and the support product my team is working on is shaping up to be damned cool. In essence, everything we wanted to do when Halo: Combat Evolved launched? We're finally being allowed to do it.

Hmm... a Halo comic... now there's an idea...