From the announcement:
We're getting very close now to the 100,000th post on our Forum, so we've decided to celebrate the occasion by having a bit of a giveaway! Whoever can guess the day and hour of our 100,000th post, will win a massive £100 worth of Pendraken goodies! Simply state the day and hour you think we will hit this milestone, and we'll see who can get the closest!
All of the rules and details can be found over on our Forum