In case you missed it, Justin Vernon of Bon Iver stopped by Late Night With Jimmy Fallon to perform "Woods" and a whole different version of "Holocene" with The Roots. You can watch the web-exclusive version of the latter here.
Also on their fb page, they posted about getting "new merch when the time comes". New material in the works?
I made a very bold (and based on no solid evidence at all) prediction that there would be a 2014 release. Other than the Zach Braff soundtrack, there's no indication of new music, but I find myself expecting it.