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Tesla's findus page lists the following locations for new Superchargers:
The New column says whether it is New for 2020.
Here's the short Maine list. I'll let others in other states list give their ideas on those.
State
Location
New
Status
Comments
ME
Bar Harbor
No
-
I feel that the Ellsworth Hannaford would be a better location overall.
ME
Bethel
No
"Permit"
Indicated by an Irving display as being at the Irving.
ME
Farmington
Yes
-
Hannaford on US-2 an obvious possibility. Would serve US-2 travelers E-W, but also allow better access to Sugarloaf for skiing as it's less than 100 miles from Kennebunk - Northbound, ME and Portland, ME
ME
Skowhegan
No
Open
Was already finished by the end of 2019, and was probably open already. It's now listed in the cars' navigation.
So, only Farmington, ME is new to the list for 2020, but that's a good location.