So the BE tie-up has meant AF are moving and I would assume that it is only right to think that DL and KL will follow suit. Remember the whole point of the TATL is to share such things (I assume DL use AF check-in etc already at T2?), besides, if I'm not mistaken AF/KL are owned by the same company!
U2 wouldn't surprise me however I would have guessed at T1, mainly for what is mentioned above concerning taxi times etc.
BMI is almost a given.
So T3 would be there for BE, AF, KL, DL, AA, BA, FI and the smaller carriers?