From the promo page:
Expand your arsenal of sounds with a FREE ReFill or artist-created Artist Patch each month until 2009! Incredible artists, like Propellerhead Guru Kurt Kurasaki aka Peff, and amazing ReFill manufacturers, like Sonic Emulations, will unlock their sonic secrets and let you pack even more power and versatility into your Reason rack.
After completing the survey, you’ll receive a monthly email from Line 6 featuring either an Artist or ReFill manufacturer, and a link to your new ReFill or Artist Patch.
Visit Line 6 for more information.