That's a tough question, there are so many variables right now that it's impossible to predict. How does the team look under Sullivan when healthy, do they continue the momentum they got from the Columbus game or show that it was an anomaly? Do the teams above them falter or continue their strong play? That last factor is the biggest IMO.
As of right now, I'd say there are 6 teams that are locks for a playoff spot: Washington, NYR, NYI, Habs, Lightning and Detroit (yes I know the Lightning are out of a playoff spot, I just don't see any way they miss). It's also very hard for me not to call the Bruins a lock, but their roster is overachieving right now and they can easily fall back down to earth very fast. So with 6 in place, that leaves 2 spots to be fought out between the Bruins, Panthers, Senators, Devils (think they fall out of the race), Flyers (think they fall out of the race) and Penguins. Would you feel comfortable in taking the Pens as one of the 2 top teams from that group? I wouldn't, I'd say they are 3rd or 4th depending on what Boston does. This team is more talented than any of those teams, but they're poorly constructed and don't work well together. I don't see them finishing above the Panthers or Senators, who would be my guess for the last 2 playoff spots.