Update: Dead! Congrats to those who got it!
Don’t have the time to rehash all the details but visit Gary’s post and Dan’s Deals post here for all details. Look on United.com, change county to Denmark and follow their instructions. This is only good for London (or UK) to US either roundtrip or one way. I booked a one way home from London in United BusinessFirst on their Dreamliner. Good luck!