When I look at new Model Ss on the order page, it says that the range is 335 miles. That is considerably more than the 265 that I have now on my 215 Model S now. Are you speculating that the "new" Model S will have more than 335 miles? Partly that is the 100 battery, and partly that is from newer motors, so I think that the new range is already being delivered.
The "new" interior could be anything. When I was at Rocklin last week I saw different wood on the dash. All this leads me to believe that "new" will be offered one bit at a time, which goes with Tesla's current method of updates. They do not do "makeovers" and they do not turn out "new" model years or months or decades. Just continuous, quiet updates.