the 737 in without low seat ( around 50 ) configuration is at it's limit around the Boston maybe at a stretch Toronto areas, so SFB direct is definetly out of the question unless stops are planned.
I would not be surprised if they lost a few seats and used the 737W's on the Glasgow to Boston, Liverpool to Newark or the UK to Hamilton flights. Seating can't be that much different to the 757 currently used by some airlines on U.K. > U.S. East Coast flights.
1 x B737-7W is destined for Aberdeen I believe, anyone know where the other is destined for ? or is it planned for longer flights.
The 767-300ER operated by Neos seem to be 280 seat unique class which i would believe to be single class with IFE so maybe it is planned to remove a few rows to offer seperate classes, dont suppose they are offering Neos catering though.