The following is an excerpt from an event description on Ticketmaster.com for UFC 75 in England:
On Saturday 8 September, the fastest growing sport in the world is back in the United Kingdom with UFC 75! The O2 Arena will play host to an incredible night of UFC action. The full card is yet to be confirmed, however one fight has been signed that has the entire country’s attention – Great Britain’s own Michael “The Count” Bisping will face Matt “The Hammer” Hamill in a rematch from The Ultimate Fighter 3. This will be the toughest challenge that Bisping has faced yet.
It's been rumored for a while, so this doesn't come completely out of nowhere. Still, Ticketmaster usually isn't the greatest source for stuff like this.