Their new positioner statement is "Southern New England's Hit Music Station" which replaced "The 90s To Now". This type of slogan is commonly found on CHRs, not Hot ACs, but it's not unheard of. It's not necessarily any indication that Coast is 'going CHR'; that's most likely reading into it too much or wishful thinking.
Regarding the legalities of the ID... I've heard at least 5 different :50 stopsets in the past month where the legal is indeed in that stopset. In the past, they have said "WSNE Taunton Providence" which is actually still illegal. Why is it illegal if the COL of Taunton is being said you might ask? It's because the "-FM" suffix can actually part of the official FCC call sign for any FM station. It's actually required for any FM if the call sign is also used on an AM station as well. Note that "-FM" can still be used even if the call sign is not being used on an AM (such as the case with WSNE-FM). -FM is also not required if a TV station (-TV) is using that call sign, as long as it's not being used on AM.
93.3's licensed call sign is for a fact "WSNE-FM" --
http://transition.fcc.gov/fcc-bin/fmq?call=WSNE. Clear Channel did use WSNE on an AM station down south about a decade ago, but it has since been changed. Nothing is stopping CC from changing the call sign back to "WSNE". Another example of this same situation is 106.1 WCOD-FM on the Cape. For at least 20 years now, they start out with "WCOD Hyannis...". This is illegal, since the call sign is officially WCOD-FM --
http://transition.fcc.gov/fcc-bin/fmq?call=WCOD. Finally, another one I have heard was 97.9 WPXY in Rochester, NY (98PXY). It is officially WPXY-FM --
http://transition.fcc.gov/fcc-bin/fmq?call=WPXY, however at some point since Entercom aquired it from CBS Radio, they are now saying "WPXY and WPXY HD1 Rochester". It should be "WPXY-FM and WPXY-FM HD1 Rochester". Moreover, it is perfectly legal to simplify this to "WPXY and HD1 Rochester". The scheme "[FCC call sign] and HD1 [city of license]" properly IDs both the analog and HD1 signal.