If we see Vaak traded for you think that means Sweeney is looking at keeping Krug long term? If they hang on to Stud + Fred + Beecher I think you see Krejci potentially moved in the off-season.
I've mentioned this before but since you're asking... if they hold onto Stud and Tfred I think it makes a ton of sense to move Krejci at the draft. Get something for him while he still has value, move Coyle up to 2c and get both young centers into the lineup next year at 3c and 4c.
The problem, I think, is that they have a lot of respect for what Krejci's done, and may feel obligated to let him play out the final year of his contract. As much as I love Krejci, I think that's the wrong move. You trade DK46 and that solves your money problems with regard to Krug, who can do a lot more for this team over the next 5 years.