As a special prize Tom received a signed copy of The Tale of Two Cities (signed by Damon Lindelof and Carlton Cuse not Charles Dickens)
Contained in the covering letter for the special prize was the phrase :
"You are a serious rock star!"
In each of the previous first purchaser letters there has been a phrase that has pointed to the next URL reveal location.
There is a lot of speculation in the comments that the Rock Star clue and the pink cross relate to the singer P!nk, due to one of her songs being So What which mentions being a Rockstar and there is a P!nk concert in Dallas on Wednesday. Mentioned first by ReverendMilo