Game comes out in 3 days. I have personally played it on 360. Playing Logan until online is allowed, then switching to Sam B.
DO THE PROLOGUE FOR EVERY CHARACTER. Gives you a free level.
You find weapons like crazy.
Zombies scale with you, but there are higher level areas.
Energy drinks heal you, but leave you vulnerable.
If the game slo-mos, you broke a limb on a zombie or something.
I haven't seen a respec option so be wise with your skill point usage.
Any other questions I can answer for you guys maybe?