They used just have Passenger Terminal (what they will call T1 from Jan 18) where KE and OZ only departed. They just refered to everything else as Departures, Arrivals, Basement Level in the public areas. The Concourse Terminal was for all other airlines. Concourse will still stay Concourse I THINK (haven't seen any signage.

I also think gate numbers will stay the same (T1 aka Passenger are 1-50), Concourse Gates 100-150 (or so), and T2 will be Gates 200-250 (or however many they have exactly).