Dan Bunting said that Treyarch was hoping to add new interactivity (like the doors on Radiation) to the new map pack so I've been trying to think of possible interactive elements they could add and since it wouldn't be any fun to stick to the limits of what they are capable, I'm sure most of my ideas are impossible for them to implement. 
 
STADIUM 
A Hockey rink, you say?  Could I please have a map specific melee weapon with the hockey stick?  It would be a one hit klll with a longer range than your knife but it would break after one or two kills.   
 
And how about a wild Zamboni death machine?  You have a two or three switches that need to be pressed at the same time that unleashes an uncontrollable Zamboni on the rink.  An objective (like the 'B' Domination point) could be placed on the ice and a wild Zamboni randomly zig-ziging across it could that could be a good defense.   
 
KOWLOON 
They might be able to do this one.  I remember that scene from the campaign when you get on the roof and the jet liner flies overhead so maybe something like this could happen randomly during matches that would block air support or cut short Hueys and Hinds.  Your hard fought for chopper gunner will be pulled out even before you reach the map because a commerical airliner is coming through.  In contrast, that Hind that is tearing apart you and your dumbass pubbie team mates who don't shoot air support - despite being level 50 and having Ghost Pro - is pulled out before it can do too much damage.    
  
BERLIN WALL 
Enough RPGs or LAWs into the Berlin Wall causes it to collapse, killing anyone standing to close.  I know this isn't Battlefield - there are plenty of Forums for you to tell me that - but that would still be neat. 
 
DISCOVERY 
I heard they were going to update it to the 60s era, but random caches of WW2 era weapons would be nice.  I would love to get my hands on a PPSh-41; one of the few things that made WaW fun.  You could even have the over-powered MP-40 with Stopping Power.  Only one clip, but enough to remind you of how broken that gun was.
 
   

Dan Bunting said that Treyarch was hoping to add new interactivity (like the doors on Radiation) to the new map pack so I've been trying to think of possible interactive elements they could add and since it wouldn't be any fun to stick to the limits of what they are capable, I'm sure most of my ideas are impossible for them to implement. 
 
STADIUM 
A Hockey rink, you say?  Could I please have a map specific melee weapon with the hockey stick?  It would be a one hit klll with a longer range than your knife but it would break after one or two kills.   
 
And how about a wild Zamboni death machine?  You have a two or three switches that need to be pressed at the same time that unleashes an uncontrollable Zamboni on the rink.  An objective (like the 'B' Domination point) could be placed on the ice and a wild Zamboni randomly zig-ziging across it could that could be a good defense.   
 
KOWLOON 
They might be able to do this one.  I remember that scene from the campaign when you get on the roof and the jet liner flies overhead so maybe something like this could happen randomly during matches that would block air support or cut short Hueys and Hinds.  Your hard fought for chopper gunner will be pulled out even before you reach the map because a commerical airliner is coming through.  In contrast, that Hind that is tearing apart you and your dumbass pubbie team mates who don't shoot air support - despite being level 50 and having Ghost Pro - is pulled out before it can do too much damage.    
  
BERLIN WALL 
Enough RPGs or LAWs into the Berlin Wall causes it to collapse, killing anyone standing to close.  I know this isn't Battlefield - there are plenty of Forums for you to tell me that - but that would still be neat. 
 
DISCOVERY 
I heard they were going to update it to the 60s era, but random caches of WW2 era weapons would be nice.  I would love to get my hands on a PPSh-41; one of the few things that made WaW fun.  You could even have the over-powered MP-40 with Stopping Power.  Only one clip, but enough to remind you of how broken that gun was.
 
   

All of these are highly unlikely.
 
It's just a map pack for 15 bucks, not new weapon models and animations or reworking of game code for destructible terrain.

" @Tennmuerti: I don't remember exactly, but I thought there was some basic destructible terrain in the campaign? Like, I think a wall I was sitting behind got shot out once, or something... "

most of these dont have a chance at happening. Many changes would simply be unbalancing to the game (hockey stick, MP-40, zamboni, and randombly taking air support out of the sky). The model for the ppsh-41 isn't in the game, and I am doubtful of them making a new one. 

i want another nuke type of place that actually launches a nuke. if anyone remembers in nuketown somebody said that shooting all of the heads off of the manikins gives a special easter egg. me and my friend were all like i hope that it's a nuke. instead it ends up being just music coming out with that theme song. i want another nuke town with actual nukes. 
 
i like radiation door thing. it's a good way to defend in some games. i say more doors and maybe a random missile launch also :)