Cathay Pacific launched Boston flights in May 2015 as a 4x weekly service. In January of this year, they added a Wednesday flight from Hong Kong, bumping the service up to 5x weekly.
They have just announced that they are finally making Boston a daily service, effective March 2017. They have tweaked the departure and arrival time a little bit:
Boston itself is probably a big enough origin/destination market. As part of OneWorld, Cathay Pacific also has access to the feed from American in Boston. It looks like the route is actually doing quite well; I often see the Boston route zero out in availability weeks leading up to a flight. Of course, some of that might be for operational reasons; flying from Boston in the winter might require some adjustments.
Personally, I am really excited about this increase in frequency. The Boston route is operated by a four-class 777-300ER, featuring fantastic First and Business class products. More seats = more award availability! (Hopefully.)
Cathay Pacific has recently began flying some of their long-haul flights with the newly delivered A350. On September 2, they began flying the A350 from Hong Kong to Dusseldorf and London-Gatwick. These shifts may have enabled them to free up some aircrafts, in order to launch an extra Boston service.