Thanks to all for the input. Perhaps my question wasn't so clear. I'd read elsewhere on this site about prices for it being set at something like -50 hours and wondered if it was going to be visible at some point before check in at -30 hours. Also, since there were only two seats left to be booked at the time, I was unsure if they would even offer it and wondered what the chances were that they would. At any rate, I scored the upgrade to SEA at check in for less than €600. Seemed like a deal to me since my total round trip originally was less than $500 USD.

I haven't posted much here and I appreciate peoples willingness to understand my unclear question and try to help.