I was interested in the 2009 game, but now there is a 2010 game, and it has basically
the same title. If I just get the 2010 game, am I going to be missing anything from the 2009 release?
Is this going to be like the Madden games, where every year, there is a new release?
2010 is not the same as 2009. That IGN review, actually more specifically Greg Miller, is utter garbage. The guy cannot even name 10 fighters in the UFC and is not a fan of the UFC or MMA in general. He failed to mention any of the pertinent updates, from the redone animations and animation system, ability to fight against the cage, revamped career mode, ability to dodge and sway, larger roster, better game mechanics, better presentation, etc.
To compare this awesome overhaul to a simple Madden update is sacrilege.

UFC 2010 is better in every way over its predecessor.