There should be a new supercharger coming sometime this year to the Gloucester Commons shopping plaza. The Gloucester pin was added to Tesla's map this year and this is the location Tesla has in mind. Discussion are already underway. If not for some issues that need to be worked out, construction could have already begun by now (but has not). Not clear when the site issues Tesla is working will be resolved, but this one could happen sometime this summer potentially.
There's already a somewhat tenuous Tesla/Gloucester connection: Did Nikola Tesla Live at Hammond Castle?
Updated information on this site. It will be an 8 stall V3 (current default for V3). It will be located at 42°37'24.3"N 70°39'16.2"W and is already permitted as of 1/04/21 (BLD-20-757) with permitted construction to commence by 7/4/21. There may still be ongoing negotiations before it's cleared to start (not sure), and of course subject to contractor and utility availability. Site plan attached. @MarcoRP