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RPGVault has the second part of their interview with Micro Forte Lead Designer, Paul McInnes about Citizen Zero. (You can find the first part here).
It's a pretty exhaustive interview about Citizen Zero, ranging from it's goals, how it compares to other MMOGs, backstory story, to factions, and more. So if you want to know in detail what it's all about, I'm sure you'll greatley apppreciate the interview...
"Citizen Zero is an action game, and combat is the core of the action gameplay. The combat model incorporates the best elements of MMOG gameplay into a shooter-style action game, and throws in a few Citizen Zero extras."