Thanks, everyone with all of your help with my questions. i can't find the post to quote it, but I did email lIPO asking about TPV being a new bookable category in RPC and she tried to help. In the end, though, it's simply too much for me to pay for an upgrade this close to the trip. Had it been earlier, it would have likely been doable.
I have to vent for a second that I think it's rotten

that no one at Disney (WDTC? Or whatever?) could have called us or emailed us or something, saying, "Hey, there is now a new option for the room category you're currently booked at- do you want to change?" We booked our trip a year ago and at the time there were no TPV RPC rooms- some RPC rooms just were TPV at no extra charge; it wasn't bookable. I feel like we should have had the courtesy extended to us to point out that now such a category existed and see if we wanted to pay for an upgrade. That's a big oversight on their part, imo. It means that we were basically at a disadvantage by booking early.
Anyway... onto brighter topics, since what's done is done. Can anyone answer me some questions about the spa, particularly as it relates to kids? We just spent the weekend at a 4 seasons hotel and dd's favorite part of the trip was the spa locker room! lol!

She loved the juices, the robes, the slippers, the sauna, etc. I think she just loved the dim, serene atmosphere, with the great smells and calming music. I was thinking of booking one of the "my first" things for her at the GF so she could have another fun experience like that. Can anyone tell me if the locker room area is awesome and the type of place one could "linger?" I saw minniesota's awesome pics and it looks that way! Just want to make sure they don't rush you because dd would be very tuned into that and it would ruin it for her. Also... can I hang out in there with her (even though I don'tr want any spa services) since I have to be present anyway due to her age? Has anyone's dd gotten a "my first..." package, and if so, did they do a great job? Dd just turned 10, so I guess she's sort of on the upper end and I want to make sure it's not too babyish. I was thinking maybe the facial, since at her age, she will need to soon start caring for her skin (i mean, to avoid pimples!); will they give her a little tutorial on that? Because apparently my advice is not inspiring her!
Thanks again for your help!