I guess it's official - the A339 is coming to SEA:
https://news.delta.com/delta-bring-m...-flying-summer
TLDR:
PVG starts 7/1 (upgauge from 763)
ICN starts 8/1 (upgauge from 763)
NRT starts 8/31 (downgauge from A359)
Pretty much expected PEK and KIX to get left out of the a/c upgrades, but I'm a bit surprised AMS missed out on it too.