A Few Ideas and Suggestions

[Apostle]

First of all I really like this game. It's very realistic gameplay and has a nice environment. What I think you could improve on it though would be the helicopters first of all. I think that they should be able to fire rockets/missiles and be easier to control. I also think that there should be a new showcase mission where it's a bomb defusal mission. I think that there should be extra infantry foot soldier based missions too, where you have a lot more troops fighting with you and more enemies. One last suggestion would be that you should add tanks to the game and more music. Thanks for reading and keep up the great work, Bohemia.

[Ragequit Inc.]

Most, if not all of those things are coming. This is still an Alpha. As in, not a full game.

[Theo Hardmeier]

Your best off doing some research on the features that will be implemented before suggesting things to add.
Attack helicopters, tanks and more missions all will be added in upcoming beta and full versions.

Ragequit inc is right on the money there.

Though your mention of a "bomb defusal" mission is a good one.
Though since disarming various types of mines and the addition of mine detectors into arma 3 they may add a showcase mission in the upcoming beta about that. (I hope)