Intel has announced that it will no longer be shipping the Arc A770 Limited Edition graphics card. This decision solely impacts the Intel-branded "Limited Edition" GPUs and specifically the A770 SKU, so custom A770 graphics cards from partners will continue to be available, as will the Arc A750 Limited Edition, for the time being at least.
It was announced yesterday that the Intel Arc A770 Limited Edition would no longer be manufactured, although partner models will remain on the shelves.