FYI I was able to book this morning for travel 331 days out. It was from Asia -> US so maybe that's why (time change) but just a tip for others looking to book at the opening of the window.
At the same time, I am dealing with a flight T-329 with 3 J seats available per BA/Qantas/JAL but 0 available to Alaska. The age-old frustration. I'm on HUACA
#6 
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EDIT: Even tried long-selling to no success. That's 8 total agents I've spoken to. They are seeing 0 J for the entire week on DPS-HKG despite BA/Qantas/JAL sohwing J3 or J4 every day (and on the CX flight, not the KA one). Very frustrating. I will likely book with AA miles instead.