slippahs: Thanks--it took 1 hour and 31 minutes before someone (you) suggested "doing your own research".

It generally seems that if you are checked in online within the 30 hour window you have to watch ITN for seat openings because it will not automatically upgrade you. My guess is that seats will open up later tonight and the upgrade will--probably--take place via the EUA if I an NOT checked in online. If not, I can go to the airport in the morning as a Platinum and see what happens.