According to this article, there will be a total of 7 A350-1000s delivered by the end of this year: https://www.flightglobal.com/airline...155743.article (alternate link https://archive.is/BWibs)

Perhaps two more routes this year if these are all delivered on schedule? The total number of FC seats for sale out of ORD seems sort of odd, starting in September the only day with 7 FC seats available is Friday. ​​​​​​LHR stops selling 7 FC seats starting in November. So if I had to take a guess, ORD and LHR will be the next routes.

I was selfishly hoping for LAX, but it makes sense that JAL wants to put this plane on the longer routes first.