I am still waiting on my copy of the game to arrive in the mail (stupid bestbuy.com taking their sweet time), what is escalation mode like? its basically a survival mode right? enemies come in waves, and they progressively get harder (how many waves are there?). you can get points or something to unlock new areas or buy weapons/ammo. if you die is it game over for you? or can you be resurrected? can you switch from scout to something else, or if you pick scout or whatever class at the beginning are you stuck with that till the end?