3dGamers have a Dawn of War map pack apparently created by THQ game testers.

Title : Unity Map Pack
Release Date : 12/10/04
Authors : THE CELEBRITY GRAVEYARD: Brian Cairns, Spencer Franklin, Sean Galvin, and Sean Jenkinson
Email Address :
Additional Credits to : THQ\Relic

Installation - IT IS IMPORTANT THAT YOU UNZIP TO ONLY THE W40K FOLDER
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Unzip the map into "THQ/Dawn of War/W40k/"

Description :
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--- Play Information ---
Game : 2 3v3's and 3 4v4's
Level Names : The Corral, Frozen Battlefield, Icelands, Rocket's Red Glare, and Temple Ruins.

I'll be downloading these in hopes of getting a chance to give them a try shortly.