The "limited availability" is almost certainly for those with per-arranged deals with Intel and 2H is almost always Q4. It's not to say this isn't an interesting product but I've a feeling Optane won't live up to the hype. But I'm reserving judgment until it gets into the wider market/ has more real world exposure.
If by market you mean someone not Intel. They probably sold all their capacity for the year to certain key customers, and possibly even with the parts not meeting spec (some companies won't care if they still see a boost), and the small guy will not see it until next year.
