Yes the SAR S92 will incorporate the internal tank (port side) and allow for a stretcher on top. But as you intimated - this will INCREASE the range the SeaKing could go to, so it is an "enhancement" of the Service
TC - I recall from visits to the ARCC that the Sea King had an ROA of 240nm, while the S92's was 250nm with its internal tank fitted - hardly a huge gain in capability. I know that it's useful to have somewhere to mount a stretcher but that's not a good reason to take up valuable space with an internal fuel tank. To my mind the S92 offers useful improvements over the the Sea King in terms of speed and its ability to operate in icing conditions; however, the 101 betters the Sea King - and the S92 for that matter - in just about every respect except cost (I agree it's an expensive option) and possibly downwash impact.