I would never trust the interoperability of different apps. Even Powerpoint and Keynote - rather simple compared to the exactness of DTP and very long in the market, will not ever produce reliable results when used together. So - even if I long for IDML export for publisher - I doubt if this will help in critical (=professional) circumstances.
I wonder if anyone has experience with the availability and willingness to use publisher on the publisher/printer side. Is flexibility growing on their side? It might even be more economical to spend them an license.
