Doesn't sound like speculation....Care to elaborate?
I am speculating......It will be interesting to see if I am close to correct. The reason I think Harley going to make engine changes is due to the length of production for the twin cam. 1999 to 2015, that's 16 years. Harley now has competition from Indian, they have a larger standard engine than Harley, 111 vs 103, Harley must desire to close that gap. If they don't make substantial changes to the 2016 touring line, sales will start dropping. The Rushmore owners will need something substantial to consider trading.
The softail line, once Harley's top sellers are now dead. My local dealer, a large store in a large market only sold 4 Heritage softails last year, they only sold 1 Fat Boy. For the entire 2014 model year. Harley needs to do something big to fire the line up, something as dramatic as the Rushmore rollout. If Harley can add comfort to the softail line, they just might start selling better. The reason I mentioned the springer heritage, it would be a great bike to compete toe to toe with the Indian classic. Both bikes represent the same period of history. The Heritage Springers would sell well with updates, IMHO.
I could be all wet, time will tell. Harley needs to light a fire under the 2016 lineup and the new "Street" line is not the answer.