I have to believe that LDV's information is correct regarding an agreement in principle for DL's move.
He said "T2/T3" and "T3 rebuild" which says that the current configuration of T3 or how it compares to T5 today means anything. A connector between T3 and Other than after hours arrivals, DL operates no flights at TBIT. T3 thus could become all domestic or DL could use T2 for international as well as for some of its alliance partners. thé TBIT is only necessary if DL intends to do the same thing that AA is going to do between T4 and the TBIT. A connector between T2/3 allows those terminals to operate as one just as T4/5/6/7/8 do.
I also believe that T6 could become the airline for everyone other than WN, DL, AA, and UA that is not in the TBIT and DL has reason to help see its int'l partners (VS, AF/KL and perhaps AM) to move into the TBIT.
As I have said and dawg pointed out, it has made sense for DL to be on the north side for quite some time and if DL's move helps AA consolidate its operations and close the Eagle's nest or at the least increase the number of gates in T4 while reducing pad gates, it is hard to not see this as a win-win for AA, DL, and LAWA and the changes will lead to growth for all involved.