Big moves like Buffalo trading Vanek or Pominville to me are more likely to be offseason moves with better structure in place with a new GM and coach and deciding what to do in terms of players/retool/system, but that said, maybe a team blows the Sabres away into making the move. I like Abo's suggestion of MPS, but that again, may be more of an offseason investigation for us. Either way it is pretty obvious Lou and Vanderbeek are expected to improve the forwards this offseason. If they don't, I think fans will tune out and some will rage. They get a pass this year due to the Parise departure.
As far as Jagr, I have a hard time seeing him go for anything more than a 2nd. He is a playmaker and an asset on the PP, but he's an older player who is going to be subjected to the playoffs grind, and I'm not sure how he'll hold up. He was literally invisible at times in our series against Philly last year.
Devils should not be considering trading Merrill for anything short of a legitimate top forward who is NOT a rental. I'd deal Merrill in a package for Pominville/Vanek/Eriksson, but not a chance I'd do it for the Jagr/Morrow/Iginla types.