I contacted both hotels by e-mail. I got responses from both stating that I will be upgraded to the executive floor, though it seems there is some wiggle room in there. One e-mail says "the upgrade is always a matter of availability at the time of check-in" and the other says "we are anticipating a full house during your stay," so I suppose it's possible I won't actually get the executive floor.
But I've done what I can and I have copies of the e-mails to show to the check-in clerks if they should try to tell me that award stays don't get upgrades or some such.
Kathy