Scott Boras is known to be willing to wait until late January (see: Prince Fielder) and even February (see: Michael Bourn) to find the right deal for his clients, but that may not be necessary with Jacoby Ellsbury. Clubs have told ESPN's Jayson Stark that talks for Ellsbury are moving much quicker than had been anticipated, and Stark says a signing as soon as next week's Winter Meetings isn't out of the question (Twitter link).
If Ellsbury's market is indeed picking up, it's been a well-kept secret. To this point, the Mariners have been the most oft-connected team, though even they are said to be pursuing secondary free agents like Carlos Beltran and Kendrys Morales more than Ellsbury. The Rangers apparently prefer Shin-Soo Choo and won't push for Ellsbury, and the Red Sox are preparing to move on with alternatives (likely Jackie Bradley Jr.) as well.