Presuming MLB goes to 32 and places one expansion team in the South (Charlotte or Nashville) and one in the West (Portland or Salt Lake City) this is how I see the leagues aligning. To make things fit, I had to swap 2 of the 90s expansion teams (COL & TB) but I think it makes things a lot cleaner.

AL East: NYY, TOR, BOS, BAL
AL North: CLE, DET, CWS, MIN
AL South: KC, COL*, TEX, HOU
AL West: SEA, LAA, LV, (SLC/POR)

NL East: NYM, PHI, WAS, PIT
NL North: CIN, CHC, MIL, STL
NL South: ATL, MIA, TB*, (NVL/CLT)
NL West: LAD, ARZ, SF, SD

However, if MLB sees 32 as a brief stop between 30 and 34/36, it might make sense to leave the existing division structure largely intact and just add the 2 expansion teams to the existing ones with no significant changes.

As cash hungry as MLB is, I could see them giving the impression that they are only adding 2 teams, only to decide to take more and pocket the expansion fees.