I maybe totally off here but if I recall correctly Kodak stopped making all their chemistry years ago. I think it was Champion Chemicals that has made all of Kodak chemistry under contrast since then. When Kodak went bankrupt they owed Champion a lot of money. Perhaps until Kodak can prove they will pay Champion for any Xtol they make and give to Kodak they will not produce any more.
Again I know nothing. This is just a guess. Xtol is too nice and popular for me to think that Kodak would actually kill it. But then again Kodak had done a lot of stupid things in the last few years.
I would start worrying if other major retailers start de-listing Xtol from their product line ups. Until then, it looks to be just a B&H issue.
"Life moves pretty fast, if you don't stop and look around once and a while, you might just miss it."