OK, here's my input in response to your questions:
- You can ask OR you can be upgraded as a surprise. If you don't ask for it and they give it to you (which is TOTALLY at their discretion, and you're not likely to know you got an upgrade until you check in,) it will not be an additional charge. If you DO ask for it, then yes, you will pay a considerably higher room rate to secure a tower room. And no, you can't really call and be like "so, um, any chance I'll geta free upgrade?" for obvious reasons - you've sort of gotta take what you get.
- Either way you'll have a pleasant stay - the Contemporary is one of my favorites and I've stayed in both room categories, and they're both very nice. Tower is better in my opinion, but I don't know that I would ever pay the rate they ask for them when Icould get the wings cheaper - I've only stayed in Tower when I was lucky to get TWO umpromtped upgrades in a row.