This is the most recent info Blake gave a few months ago:

The content you are referring to was culled from previous products and altered for use with the older system in MOTIFXF/XS and MOXF but NOT specifically designed for those products (For example, Power Grand came from the original MOTIF content from over 15 years ago). This is something that the development team is aware of we will update if and when it becomes available. We had a similar issue with the free Chick's Mark V collection. That data was initially not compatible with MONTAGE but was converted and re-released.

Apologies for the confusion.

Update on older wave content:

We have converted the files in question and our initial tests confirm that it is working properly in MONTAGE. We will update when the content becomes available. Thanks for your patience

?

im also waiting... what happens??

Any update on this? Blake Angelos said that the Yamaha team successfully converted the sounds of the Inspiration in a Flash and Ultimate Piano more than half a year ago. Been looking forward for this! When is it happening?
Thanks guys.

Any update on this ? (it has been 4 years)

The original content providers of this (not Yamaha, 3rd party) have released a mandolin conversion from IIAF. Links gave previously include those threads. You can hunt down the rep of that company and perhaps request a specific sound and possibly the conversion will be done by them.

Also mentioned in the thread - some (or at least one Performance) of the content is already integrated in the presets.

Hello,

We cannot release the Inspiration in a Flash content set for our current synths lineup. There are reasons for this that I can't really get into. Apologies for the confusion.