Mag is a new game that comes out the 26th.
It's only for PS3. Basically MAG stands for Massive, Action, Game. And it doesn't lie. In a battle there are max 256 player (128 on 128)
besides the big matches there are 3 fraction- Valor, Raven and S.V.E.R
You never leave your faction
It's a first person shooter
Here's ad overview of the Fractions
Valor- The traditional military, rough and tough
Raven- the high tech and futuristic fraction
S.V.E.R- The rag tag and Gang-like team