You never know when they will decide its good for early release. In those above posts, apparently unguided simple munitions will be available at release, and then the fancy stuff rolled in. In my opinion, that would put it very close to release, given that we've seen it fire unguided munitions and takeoff/fly/land. Its kind of a weird situation because if its going to be released minus a bunch of features, where do they draw the line on enough features to make it release ready? I would imagine the majority of buyers would purchase it even if it was only in the E3 demo state, if it was released today.
I think ED would be wise to start allowing the sale of closed alpha keys, maybe paired with a map pre-purchase. For example, buy Normandy, get access to closed alpha F-18 key. Lots of developers do things like this, e.g. Buy Battlefield 4 Premium, get closed beta access to Battlefield 1. Then when the public version is released you have to buy the module like everyone else.