I was just browsing the GAME website when I spotted that they have a Special Edition available for Assassin's Creed: Revelations (unsure whether this is an exclusive though)
PS3 -
http://www.game.co.uk/PS3/Action/Adventure/~r355278/Assassins-Creed-Revelations-Special-Edition/
X360 -
http://www.game.co.uk/Xbox360/Action/Adventure/~r355277/Assassins-Creed-Revelations-Special-Edition/
PC -
http://www.game.co.uk/PC-Games-and-Downloads/Action/Adventure/~r355319/Assassins-Creed-Revelations-Special-Edition/
No other details as yet, except the price. The PS3 and X360 versions will retail at £44.99, whilst the PC version will be slightly cheaper at £39.99, and is listed for a vague November 2011 release date