Seattle has been long rumored to be the #1 expansion candidate for the NHL and now people are starting to indicate they may actually be close to an announcement. Per the Seattle Times (link):
Sources have indicated that talks between the NHL and local officials were far enough along that some type of announcement could be made within weeks of the Sochi Olympics concluding. Daly told reporters in Sochi this week that no expansion announcement was imminent.
But it’s unlikely the league would delay an announcement beyond June if it intends to have new teams in 2015-16. Expansion teams typically need a couple of summers to do proper marketing and prepare temporary arena facilities.
Some mixed reports there but rumblings certainly are indicating Seattle will have a team sooner or later. This article even goes so far as to suggest that another team would likely be added concurrently to even up the league (since there's 14 in the West vs 16 in the East). KC and Quebec City were floated FWIW.