I recall reading a thread on DPReview where one of the posters linked to a Japanese site with a patent image of the 80-160mm f/4.5 SR, so it's surely on the way, question is only whether it will come before the normal zoom. I'm just theorizing here, but since the word "Tele Zoom" is slightly above the other one, it might come out first. The words "or later" infer that Pentax isn't sure they can roll out both lenses in 2015, which I wouldn't be surprised one bit if they didn't.
If it'll have a good 4 stops of stabilization and optics superior to the already good FA 80-160mm, the updated lens will be a force to be reckoned with indeed. It's arguably more desirable to me right now than the 90mm macro - better SR, a wide focal range and f/4.5 is fast enough for anything.
Edit: Here is that patent page translated via Google.
Link