Flew JAL F yesterday HND-ORD. I actually didn't know anything about this, but the FA showed it to me in the catalog before takeoff and told me that if I wanted a bottle she'd hold one aside for me. Like I said, I didn't even know what it was, but I came across this thread and got her attention as soon as we took off and said I wanted one and I was able to purchase it. Just sharing here to say that this year's allotment is still available without pre-order.