TBH, all I'm hoping for from Roland is maybe some updated iPad apps, and MAYBE the first of the promised Expansion Sound Packs for the BK-9. And even that, I'd be surprised if it isn't primarily something for more 'ethnic' areas - Balkan, Middle Eastern, that kind of thing.
What I'd REALLY like to see is more SuperNatural sounds, with maybe some better programming on them (I think Roland nailed the guitars, but the horns are still a bit 'beta', IMO - not bad, but not quite up to Yamaha's SA2, yet).
The other BK-s could definitely use some updates, so they can use the BK-9's 'Performance Editor' app... Plus it would be nice to see some of the BK-9's updated OS features on them, like the Dynamic Arranger and Mark/Jump for SMF's.
But with Roland's Arranger Division still probably in a rebuilding phase (after production was yanked from Italy and sent to China), I would be unsurprised to see nothing from them for the arranger player.
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An arranger is just a tool. What matters is what you build with it..!