I think our best shot at getting a decent amount of snow from Friday is the system shooting to the North slightly faster than currently modeled. The NW high, with accompanying arctic air, will prevent the system from being tugged West and will in the end force it to the east. One major difference from prior runs in the 3z Nam is the northern flank of precipitation and low pressure advances farther to the North before getting forced west. A stronger system would definitely help with this, so unlike Monday's system we want this to become stronger earlier.
If the shifts that would need to happen (still somewhat unlikely as of now IMO) happen, this storm will catch the general public off-guard big time. Even cape cod weather forecasts have little to no precipitation in the forecast for Friday/Sat.