You may remember when "hackers" gained access to the internals of the Halo 3 beta...
A particular user (his name is omitted for privacy reasons) was friends with the people that broke into the beta to access information and references in the code about the story and such (don't worry no spoilers here). I asked him for some map names via a PM and this is the response...
"DCEmu Forums:: The Homebrew & Gaming Network :: PSP Dreamcast Nintendo DS Wii GP2X Xbox 360 GBA Gamecube PS2 Forums;http://www.dcemu.co.uk/vbulletin
Private Message Dump for User ExcruciationX; September 20th, 2007 14:42 -->
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From : (Omitted) To : ExcruciationX Date : 2007-05-20 21:24 Title : I'll be nice and say a few. --------------------------------------------------------------------------------
I don't want to list them all because my friend and I aren't sure if they are maps or not, but here are a few we uncovered. Please though, for the love of god, don't say anything about this to anyone.
Here are some.
Isolation
Warthog Inc.
Epitah
Chill
There are some more, but I'm not going to say yet. We are in the process of uncovering more info. Luckily, our friend compiled us a nice program that can help."