like the OP said, there is an interview in which Tanaka said "Tanaka: Actually all of the design is ready, so we were planning to implement them into the game, however during the development process we had to put priority with what to put into the game, and due to the man power issue we had to give up implementing them into the beginning of the game. You will see them as an NPC, but it is not a race that you can choose at the beginning. We’ll see how it goes in the future, it might be a possiblity. We are still looking into it." so adding them to the game now shouldnt be too difficult, the thing that would take the longest is programming the code for all the weapons and gear for the new races, but since most of the gear in the game right now looks pretty much the same i bet they would be able to pull it off by ps3 release.