Googled for ArmA 2 maps over on ArmA 3 , did not find any realiable source AT ALL, and also for DayZ to work in arma 3 you would need to re-write most of the code, think about all new weapon classes,object id, loot id, this would take a bunch of time. And there is no need for ArmA 3 dayz since as you said, standalone is coming.
the Alpha is coming up with the tools to fully edit mission - wich is enough for the modders to start converting their work for Arma 3.
About an Arma 3 DaiZy : you'd have to re-create all of the weapons, vehicles and tools - since A3 uses futuristic ones; the same goes for zombies since the skeleton & animation system has changed. Wich is what they've been working on for the stand-alone...
Except for that, I guess it would be doable - and having an alternative Zombie/survival SP mod for Arma3 would make sense : I bet y'all there won't be any SP in DayZ.
It wont fit. You cant import arma 2 maps into arma 3 and there wont be any tools to do it anyway until arma 3 full release.
Dayz in arma 3 would suck anyway
How come I ported the Chernarus, and Utes maps into ArmA 3 without issues?
All you need to to is copy-paste the required files for chernarus and utes into the ArmA 3 addons/mod folder.
DO NOT COPY OVER ANIMS.pbo, or WATER.pbo. You can also port over all ARmA 2 weapons, and vehicles.
DO NOT ATTEMPT TO SPAWN AN ARMA 2 UNIT. IT WILL CRASH.
On topic, I'm working on something like this. It'll be very barebones but I'll see what I can and can't put in the game. There won't be any bandit, survivor or zombies skins at all, they just don't work. The current ArmA 3 models will have to do. Don't like it? Well that's just a shame.