Hi. I found a little info on it.Disney did have a site for it but i no longer have it. Sorry. I did find this.
Personalized Disney Brick - 50th Anniversary Special!
Special 50th anniversary bricks with a bronze medallion of the "Happiest Homecoming on Earth" logo will be sold for $150. Guests can personalize their bring with up to three lines. No personal messages - text can include names and dates. These Disney bricks will be set in their own special area in the Esplanade.