As per SEA D lounge staff...."end of the month" and on the side , "they are hoping to make it by the end of the month".
Reading article in Beyond magazine now and pic looks pretty sweet.
As per the article, "The lounge will focus on healthy and fresh food offerings, by local bakeries and vendors. Food and snack options will rotate regularly..."
Sounds like an improvement to what is currently offered in D and N.
Will be flying on July 5. Hopefully I will be able to report on an open C lounge.