I got in contact with Kimberley Dahme's personal assistant, and it appears that Kimberley has done some work on Boston's new album.
This raises the question as to whether or not she's part of the band. Unfortunatelly Kimberley's assistant was unable to give me an answer to that question as of yet (so speculate whatever you so desire!). Personally, I really hope she's in the band :) So, there is that possibility that she could be among those in the lineup listed in one of the Jan.01 posts in this page.
Make sure to visit her website at http://www.kimberleydahme.com