I would guess that it would be the KE lounge since they are a partner airline or it could be the United Red Carpet (as it was in SFO previously). Either way it is definitely a contracted lounge as EK does not have its own facility there.
I will ask you to please refrain from double posting in the future. The Newbie thread is read daily by many members and questions do get answered regularly. I imagine since it is a new route, nobody knows for sure the answer to your questions.