A bit surprised...I'd thought they would've gone for Voluntary Manslaughter.
Thoughts?
As to why not VM, it seemed too "deliberate" in the sense of a rather calm and measured approach to it all by the Z man, assuming there is no evidence of an "unexpected" physical altercation alleged by Zimmerman.
Some of his story might check out. 911 supposedly asked him for the address and claims he stopped to check the house number.
This one is going to be dependent on forensics, i.e. how far was Martin away from the gun, and what was the angle of the bullet?