I guess since we know nothing about it, thats a broad question. What do you want to see, new maps, weapons, new story. Or what do you think it'll be? And how much do you think it will it cost?

Some fun multiplayer. 

Mostly new weapons and maps. A map in an urban environment that isn't already blown up would be good.

" Some fun multiplayer.  "

Hookers.

To be able to play music in the choppers like in Battlefield Vietnam; specifically Flight of the Valkyries.

CCR

Lt. Dan

Did the original vietnam have jets and would that be possible?

This guy 
 

New Maps... Oh and yes Lt. Dan.

I think more clean water and plumbing would be nice. Wait, you don't mean Vietnam the country...

new maps and a weapon that lets me tk wookies siting in spawn sniping all game well i get eviscerated trying to go for a crate

I want better conquest maps. I hope they take some of the best Battlefield Vietnam maps and remake them and not just all the small ones. 

Is there supposed to be a story involved or is it just basically a whole new mulitiplayer game?

i want to be able to stream daft punk and deadmau5 to the people riding in my UH-1

also i want the radio and jets back. 
 
cant have a vietnam game without bombing a jungle listening to creedence clearwater revival

I hate to be that guy but I am not cool with playing a game based on the Vietnam war.  At least with WW2 you had clear cut villains in the Nazis and even the Japanese were doing some pretty evil things to the Chinese. Vietnam on the other hand has too many shades of grey and to be honest my mom was nurse in a VA hospital psych ward so I have heard many horror stories of what those guys went through.  So I kinda find it deplorable to think about some 12 year old playing as the Viet Cong while tea bagging some dead American solider played by some other 12 year old calling him a "noob faggot".

" To be able to play music in the choppers like in Battlefield Vietnam; specifically Flight of the Valkyries. "

New weapons and maps. I don't care about singleplayer.

Robin Williams saying "Goooooooooooooooooood Morning Vietnam!" at the start of every match.
 
And Lt. Dan.

Some of the urban maps from Battlefield Vietnam remade, DICE have created an great engine for destructability but there are virtually zero proper urban maps in Bad Company 2 to really blow **** up in.

" @B0nd07 said:

" To be able to play music in the choppers like in Battlefield Vietnam; specifically Flight of the Valkyries. "

You took my answer. =(  Flight of the Valkyries on the jeep radio was the best part of Battlefield: Vietnam (for me at any rate). "

Powerups from the drugs that the soldiers take.

" CCR "

" Helicopters and a CCR soundtrack. "

I want Battlefield: Vietnam, but prettier and with Avalanche 2.0.

" Robin Williams saying "Goooooooooooooooooood Morning Vietnam!" at the start of every match.  And Lt. Dan. "

Chuck  Norris as an unlockable

I want it to be like BF Vietnam. Obviously.

Tet Offensive so there's some degree of urban combat.

" i want to be able to stream daft punk   

I'm disappointed because it's just an expansion pack with 4  new maps that can be played either in rush or qonquest. Of course there will be new weapons and such,but i have a feeling it will be an expensive add on. And it seems odd that DICE is already working on the Medal of Honor multiplayer. Is there a market for all these online shooters?

Mel Gibson.  COMEBACK BABY!

I don't know exactly what I want from it yet but its made me want to buy the original again xD

Agent Orange, punji sticks, and John Rambo, that's all I ask.

Man.... I just want Hueys and Jets, and patrol boats. Big patrol boats. 
 
Is that too much to ask?

Rock music. Ride of the valkyrie. Lots of choppers. Jetfighter planes. Napalm. Bigger, more open maps. 32 players for consoles versions too.

i want the maps to be more varied and open ended like Bad Company 1's.

" @lilbigsupermario: uhh yea, but no "