Yes, the platform will be extended about 100' north. Everything is being placed on new pilings, and the platform lowered so to match the step on the coaches (and not the coach platform). The handicap access ramp (and main boarding flow) will be on the east side of the Sheepscot station building, so that check-in can be done via Sheepscot station's ticket window (across from the gift shop door.)
Finally, parts of the mainline will be planked over, to allow the siding to be used for passenger operations - which will be very handy on days when two train sets are in operation or other special circumstances.