I figure it is going to go pretty much how the APA wants it to go. Their updates have already focused heavily on the retirement numbers, so I am guessing they will go with whatever method maximizes their folks seniority. Meaning the method that puts the oldest pilots that are closest to retirement above their guys and resist anything that puts younger pilots above their older ones.
I figure if you want to see what direction they are going to take, 3 way or 2 way the only thing you have to do is look at the above consideration. Now on the legal side who knows how it will all wash out, but as far as what I think they will be pushing for, 3 way is my guess. For the simple fact that it adds a bunch of mid to late 50's guys into the reletive mix at a higher level than a 2 way that includes NIC and would add more late 30's and 40's guys at the higher level.
Time will tell though.