Disklavier

For what it is worth, I don't agree with you.  It "could" be done, but 
likely won't because Yamaha does not think it is worth it.  I 
personally don't think that trading in a piano ever few years is NOT an 
acceptable upgrade path for a piano.  Especially for folks (like me), 
that purchased Mark IIIs only a few years ago.  It was part of the 
sales pitch they gave me....  I would easily spend several thousand 
dollars for a new control box to get upgradable features... SJ

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Until the Disklavier MkIV came out, all Disklaviers were basically 
hardware-based. Each successive model was electronically & physically 
different from the previous model. This means that it is not 
economically viable to produce an updated control unit. It is much 
cheaper to trade in your old piano and buy the latest model. As an 
analogy, try getting your car dealer to change your 3 year old Toyota 
into a Lexus - it may be possible, but you wouldn't want to pay for it. 

As far as ethernet, wireless control, etc. are concerned, there is an 
easy option: get a laptop and connect via MIDI.  

athomik