I think we're getting away from reality here, just a hair! For Pete's sake! That Wersi is about $10,000...!
And PLEASE! An arranger that anticipates what the next chord is before you play it?

The new Yamaha Kreskin?

I am a real human (technically

) and even I can't tell what the next chord is going to be before someone plays it unless I already know the tune, AND the substitutions the player is going to use this time round, AND the form he is using this time (real players don't always play things identically each time)...

However, were Roland (or anyone, I don't care who) to return the Chord Sequencer (don't get it confused with something you put the changes in in advance, it worked on the fly), there IS a possibility for the chord sequence to be analyzed once the 'Play' button is hit, and at THAT point (the second time through the changes) the arranger could introduce voice leading and anticipatory walks, etc..
We've got to try and understand the difference between science, and science fiction, folks..! Don't give up your day job for that house gig on Pandora

Oh, and chas.... come to the Roland-arranger forum some time (and especially the old forum, now sadly offline) and you would see a LONG list of Roland users bemoan the loss of the Chord Sequencer. It's kind of like that sampler in your PA1X. Not that many people used it. Doesn't mean it wasn't a REALLY useful feature to those that do, and if Korg had dropped it for the PA2X, just because only the people that had used it would howl makes it no less vital a feature. I mean, do you REALLY want arranger manufacturers to strip their products down to what only the majority actually USE?

Take a look at the low end... THAT'S what would be left!

I agree that perfecting some of the features that exist in our current arrangers should be first and foremost for the manufacturers' R&D teams, and a LOT of what's posted here is kind of that, but all in all I'm surprised at how little much of us want IS actually, firstly, not on another existing arranger, then secondly, withing the laws of physics!
You know what I would MOST like, to be honest (other than the bloody CS!)...?
I'd like to see bombproof copy protection for styles. Secure delivery, watermarked, serial# keyed, uncrackable copy protection for styles. THEN, all the talented people that make those killer ROM styles for each new arranger would be able to make a living keeping doing it in between model releases, secure in the knowledge that they won't get ripped off. Have you ever wondered WHY great styles are so unavailable except when a new model comes out? That's why... plain and simple.
Take theft out of the equation, they could sell them at a fraction of the price of current high quality styles and make tons MORE than they do now... And, let's be honest, many of us buy a new arranger primarily for the styles (OK maybe a new sound or two) but a never ending supply of great, ROM quality styles would keep most of us away from wishlists like this!
Sometimes, it's the LITTLE things that matter most...