To answer my own question, I googled it and found this:

http://nanoomi.net/archives/13807

Says that OZ has agreed to move to the new terminal, leaving the existing terminal all for KE. Guess that means a brand new OZ F lounge for me to try when it opens up. Looks to be way bigger than what OZ needs, so I imagine they'll at least move the Star Alliance carriers to the new terminal. That could be good in some ways (easy connections), but bad in others (lots of *A passengers sharing the same lounge with OZ passengers). Wonder if KE will take over the old OZ lounges and have more capacity. Well, still 4 or 5 years down the road, so no need think too much about it all for right now.

On a side note, when I flew in yesterday, I got a good view of the Mag-lev train under construction. Seems to be coming along well. I think it's scheduled to open up the first section later this year.