Today I talked to the customer support and asked them some questions about my connection problems. Then I asked him about the ranking system. He didnt tell me much he said that there are challenges to complete like surviving 15 rounds with the same weapon. In addition, he said that Treyarch will release some new information on Twitter and official forums in the next few weeks.
So stay tuned
This is the Chat Log (I deleted the name of the customer supporter)
( 25m 57s ) Visitor: how does the ranking system in zombies work?
( 26m 34s ) Customer Support: What do you mean by ranking? Are you referring to leader boards of Zombies?
( 27m 16s ) Visitor: No there are symbols like the crossed bones, skull and skull with shotguns
( 27m 30s ) Visitor: i want to know how to get a better one
( 27m 42s ) Visitor: nobody in the internet knows the answer
( 29m 3s ) Customer Support: Okay. Got it. Some of the emblems for zombies requires finishing some of the challenges. Like, You have survive up to 15 levels with the same weapon.
( 29m 18s ) Customer Support: Those are unlocks for the game.
( 29m 56s ) Visitor: Ok, and where do i find the challenges or are they secret
( 30m 23s ) Customer Support: I'm very sorry but we don't have that information yet. We would recommend you check our forums for updates.
( 31m 12s ) Visitor: Hm ok
( 31m 58s ) Customer Support: We will be sending updates about that. I would recommend following treyarch through their twitter account for further information.
( 33m 7s ) Visitor: ok, when do you give these upates roughly
( 34m 0s ) Customer Support: A week or so. Some gamers try to do their on compilation of the game. Best information to get it is through the forums
( 35m 15s ) Visitor: Ok, thanks for the great infos
( 35m 33s ) Customer Support: You're very much welcome Scott. Is there anything else that I can assist you with today?
( 35m 47s ) Visitor: No, then bye
( 36m 0s ) Customer Support: Goodbye and take care!