I can't find anything to substatiate this rather wild rumour, which I admit I received third hand. I had a look 'round RAMD but I couldn't find any discussion of it there, (not that this is a reliable source). Perhaps it's old news.
Here is a link to a discussion by Dave Gibbs (my old M&M instructor!) of the Blue Devils of the B-flat instrumentation rule change from 1999 for those old farts like me who haven't been keeping up: http://www.bluedevils.org/about/press/multikey.asp
I'll keep looking...