How much of the final game do we have right now?

I am just wondering how much of the game do we have on our hands, is this the whole game or is some content missing and what is bound to change?

Look at the map, the part with the line around it is what we can play in. The big island to the north, I believe, is in the full game.

We just have access to the newbie Island in the beta.

Regards Grimar