Careful with those crystal balls, Bacchus...
People been predicting what the NEXT Roland arranger is going to be for over three years now! Personally, I think Roland are GONE from the TOTL arranger market... too small in these recessionary times. Even downmarket, it hardly seems like their heart is in it. To be honest, I think they are running on fumes.
And, contrary to what the fanboys say, it is utterly obvious to all but the deluded that the vast majority of the arranger market isn't in the slightest bit interested in a complicated, do-it-yourself open arranger. If they were, Lionstracs would be the market leader and Yamaha would be a niche product..!
And we ALL know that's patently not true.