I am not sure if it is an April fools, or what... but this is going to be amazing if they do release it. http://www.pcgamer.com/arma-3-ace3-mod/
I would give actual money to see an actual product with Bohemia's blessing. Edit: To clarify - a community DLC that Bohemia didn't turn around and appropriate for a later DLC.
Honestly, if the guys doing this got paid by Bohemia, I would LOVE to see this integrated into the game.
I've always thought that would be an interesting/kickass strategy for a developer. "We like what we see. Hit these benchmarks and we'll adopt and pay you €x."