In two different articles, Nikkei Asian Review gives some more hints about Nikon’s mirrorless agenda.
In this article, Nikkei confirms that Nikon’s full frame mirrorless camera is set to be announced on August 23, 2018.
In this article, Nikkei states that
The model (the upcoming MILC, editor’s note] is on the pricey side — 200,000 yen to 300,000 yen ($1,800 to $2,700). Sales are scheduled to start in autumn at the earliest.