usually not until the affy has been confirmed by them and all the papers are in order, that is normal on big prizes requiring confirmations after all has been signed and received by them.

The affy that I got from Blue Bunny Ice Cream for their Moosic Sweepstakes some years back also stated in it that to everything else I agreed to by signing it that I was agreeing not to disclose information on the ice cream name and ingredients that I came up with that won me the grand prize until such time (if at all) that it has already been introduced to the market.  To this day, I still don't see it on their product list.  So, I still am under that agreement not to disclose any information.

Who?  Me?