I've found Taylor to be a company of integrity, so it's hard for me to imagine Bob, Kurt, Andy and others sitting around the office saying, "What new gimmicks can we come up that will sell more guitars?" Instead, I think it's more like, "How can we improve the sound of our guitars?" and then WHEN FINISHED those changes are turned over to the Marketing department to pitch it to consumers.
So to answer the original question, IMO there is no marketing hype. Hype implies that there's no substance behind the improvements and the company is trying to dupe buyers, and I don't think that's the case here at all.
So I think we can distill this question down to whether the improvements are significant or not, and leave marketing out of it completely. As I see it, Taylor decided to branch out and perhaps go after a different market: Players who DON'T like the signature Taylor sound. (For the oldies among us, it's sort of like when Coke went after the Pepsi market by coming out with "New Coke," which tasted a lot like Pepsi.)
I admire Taylor for branching out and exploring new sounds, even though I don't personally like the new 800 series changes. To me the rosewood pickguard looks like laminate flooring trying to look like real wood (even though the Taylor pickguard IS real wood); I don't care for the look of striped ebony; I REALLY don't care for the price increase for those improvements; and the tonal changes to me were subtle rather than earth shattering. I know it isn't an exact comparison, but there was a 914 that I much preferred soundwise compared to the new 814 I played.
I have to wonder how much of the tonal differences are due to the new strings. On any guitar there's going to be a very noticeable difference between 80/20s and PBs, not even factoring in messing with custom gauges on the treble strings.