Donny... what technology is changing fast? I really don't see much in the way of innovation in either the arranger or WS worlds, lately...
Yamaha's drum audio loop technology is years old, pioneered by Ketron (who have gone FAR beyond simple drum loops). All software arrangers still suffer from poor soundsets to work with (compared to the TOTL hardware ones). What has come out lately that doesn't scream 'same old, same old'?
The Kronos might have stepped up a bit, using streamed SSD samples instead of ROM, and rehashing Karma a bit, but all in all, I don't think anything you could call cutting edge has come out for a few years.
Plenty of life left in the Tyros line (might be time to address those wimpy drums once and for all). Yamaha would be shooting themselves in the foot bringing out anything 'totally new concept & design in Arranger KBs' given how conservative and willing to accept very little in the way of improvement their regular customers seem to be..!
My prediction for the T5? Audio drums, like the S950, but a lot more of them. And a way to quickly load up new ones.
Groundbreaking? Hardly!
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An arranger is just a tool. What matters is what you build with it..!