Speaking of Harper, the current theories seem to be that he will wind up in pinstripes, along with Orioles' third-baseman Manny Machado, who will also be a free agent after 2018:
https://www.washingtonpost.com/news/...=.470d2066fc04
Just google "Bryce Harper Yankees" and you will be inundated by stories. Buster Olney just posted a story claiming the new CBA makes it more likely that the Yankees can land Harper.
Of course, a long way to go -- and as JB Duke suggests -- his value will be shaped by what kind of seasons he has in 2017 and 2018. Will he regain his MVP status from 2015 or remain at the slightly-above average level of last summer?
As for the Yankees, there is apparently a lot of interest in mid-level free agents. The only big money guy that the Yanks are pursuing seems to be Chapman, who wants to return to NY. The Yankees may deal some of their new prospects for a starting pitcher of note (Sale?).
But the speculation I read (and I read a lot of Yankee stuff) is that the team will be making just minor moves until the potentially great free agent class of 2018 -- Harper, Machado, Donaldson, Harvey, etc. That's when they re-open the vault.