Could be anything....a signed picture or little gift in the room, better view etc. no way to know. I don't want to give you false hope, but we had a split club level stay 2 years ago at Contemporary & Yacht Club. I booked thru the bounceback line. The CM was so nice & we chatted about how we were going to celebrate
Disneyland's 60th anniversary in September & then my DH's 60th birthday at WDW in December. She remarked a couple of times that she was marking his birthday down because you never know what pixie dust might happen. Lo & behold, we were upgraded to 2 bedroom suites at both hotels!! Only the second upgrade we have recieved in 25 years of stays. I can't prove it, but I am certain that bounceback line CM had us upgraded.
Anyway, don't get your hopes up! Just wanted you to know it could be anything or nothing.