Anticipation of this (and other) game releases combined with a low share structure - only 550m OS.  The company is also developing a Merlin game to coincide with the popular TV show. 

I'm always leery of the 'sell on news' morons, but like I said, this confirms the product is now for sale which equals revenue.  Being backed by Paramount Studios is huge - they don't do things unless they see the potential for making money!