As a prospective member of the corps (I have a good feeling about it), I can say that they told the people that auditioned at camps what they were playing, and told us not to say anything until at least December 6th.
Now, the staff didn't announce anything about it then, and still haven't. So technically no one broke a verbal promise... but it still makes you a jerk when you explain the magic trick before performing it.
Some of what the post said may or may not be true, but I'm excited for the music that I (hopefully) get to play, and I'm looking forward to it being awesome. I'm glad you all are looking forward to the upcoming season, and hopefully you can still play your guessing game for a little bit.