For those who managed to catch GuitarHero.com's promotion for free dlc, those e-mails are finally going out. I just got mine today, that's how I know.

For those who missed it, you had to go on GuitarHero.com and register your unique serial number on the guitar that comes with World Tour. It happened roughly 7 or 8 weeks ago, and had little to no word of mouth, so I'm guessing not many people caught on until it was too late.