CFe type A are smaller than type B but only have 1 PCIe lane so the max speed is 1GB/s. Certainly fast enough for 12mp video recording modes. Type A spec was only released in Q12019 so very recent/bleeding edge. I hope that owners of the A7Siii have been able to get cards and are happy to pay the early adopter pricing.Looks like everyone have made their call already.
Sony will use Type A cards
While Canon, Nikon and Panasonic will use Type B cards, which are bigger, but faster and more common and backwards compatible with XQD.
Given Canon's reluctance to approve some type B cards with lower speeds, it seems unlikely that type A cards could be used for 8k raw - for internal recording at least. So if Sony want to have a R5 competitor then they will need to move to type B cards.