The one, single thing you're most looking forward to?

[Flash Thunder]

attachTo

attachTo "moar framez".dll

There you go BIS I just did all your work for you.

[Multiautis]

Better sounds and visuals Imagine watching a artillery barrage from under the water, and seeing ragdolls just flying around scattering into the water around you. Going up to the surface watching and attack helicopter make short work of the survivors, hearing the rattle of the main gun hitting the water surface.
Make it happen Bohemia

[Kirq]

I know it's stupid, but I can't wait to test new animations system and ragdoll

[antoineflemming]

I know it's stupid, but I can't wait to test new animations system and ragdoll

That's not stupid. Besides the new features and graphics, that's one of the most obvious differences b/w ArmA2 and ArmA3. I want to try out that and the gear customization system.

[M.Evans]

Formation Flying.

[stndbfrgrn]

"Trotting across in the light of our romantic sunset..."

[jhoson14]

Something i still have hopes for.

Full 3D editor!

[Timnos]

Rabbit hunting on Lemnos with one of these

[Clowns2]

A complete editor from starting by placing vehicles/men on map to scripting and publish/packing for server.

[CameronMcDonald]

Rabbit hunting on Lemnos with one of these

Offtopic, but anyone else ever seen a minigun slung beneath an Apache? Got to love the press.