For what it's worth, Clear Channel is definitely on an Adult Hits kick.
WHLK/106.5 "The Lake" here in Cleveland has been a solid performer since Clear Channel dumped the old hot AC "Mix 106.5" format a year and a half ago.
That success has emboldened the company to start spreading the format: the most recent Adult Hits convert is a new "Lake" format in Charlotte. (And of course, since there's no significant "Lake" in Boston, "The Harbor" would be a good water-themed name.
I would not at all be surprised to see them plant Adult Hits on 101.7 in Boston, particularly since it was well-known that "Mike FM" was a good biller...until Entercom was basically forced to flip it to WEEI-FM because of the success of "The Sports Hub".
If there was a 101.7 betting window, I'd put my money on Adult Hits.