For a start of, all those with secret 'in the know' friends have been predicting the imminent arrival of a new TOTL Roland for three or four years now... Me, I'd start (after they have let you down repeatedly) to doubt they know what they are talking about.
C'mon, guys! You can't seriously have forgotten that you said EXACTLY the same thing for the last two or three NAMM's, can you?
And, how short are all your memories? Roland have been selling arrangers (particularly the mid and upper level ones) through mom and pop piano stores from before the G70. Didn't help sales one TINY little bit, did it? IMO, it actually hurt, because mom and pop stores don't discount like MI stores (nor are they much interested in selling comparatively low margin items like arrangers compared to pianos), and are much harder to find.
To be honest, Roland in general, including WS's, are treading water. They haven't come out with anything you might call truly innovative for years. V-Piano might count, but it has yet to trickle down to anything affordable, and it is still just ONE sound. FantomG is just same old same old, I'm just wondering where the technology that is going to propel a new TOTL arranger to prominence is coming from? Only Yamaha so far has managed to come up with anything (SA) that started on an arranger and migrated the other way. Usually, you see new technologies on WS's and synths before they get ported (MUCH later) to arrangers.
Plus, let us be honest. Yes, there's a new engine and some new samples for the Prelude/GW-8. But there isn't anything remotely groundbreaking in its' OS or operation. Roland still eschew multipads, don't incorporate a sampler, refuse to implement a break/fill, have no DNC/SA, no Mega-voice similarities, dropped countless GOOD features without replacing them with better ones, etc., etc..
If this is the future of Roland, they are still mired in the past.