Divisional re-alignment is probably off the table for this year. So we'll see Winnipeg play in the SE division, until the NHL gets its house in order ("confirmed" by at least one eastern team official being told to expect 2 trips to Winnipeg next season). The NHL will want to plan this right - but there are deeper rumblings afoot. The obvious choice is Winnipeg in the NW and Minny to Central, or Colorado to the Pacific and Dallas to the Central. Then Nashville or Columbus to the east somehow. HOWEVER:
Phoenix is still unresolved, and may still be by next season. While currently a long shot, if Phoenix is still in the same boat you have to think that Quebec would be looked at. So that's a western team moving back east. And there are several more southern US franchises that could easily move somewhere else. A lot of this depends on how much of a precedent is set with the Thrashers moving. Several other owners could conceivably approach the NHL asking for relocation after it happens the first time. Plus, apparently there are longer-term re-alignment plans being looked at. I've heard of a wacky plan with 3 conferences (!) - West, East, and Central. Sounds silly if you ask me.
Bottom line is, don't expect anything soon. But boy howdy do I want the old Smythe division back.
Of course, the running joke today in my office is that Atlanta might keep trying for an expansion franchise every decade or so, fail, and move it up to Saskatoon in 20 years. Eventually we could have a "former Atlanta teams" division.