The recently announced Radeon RX 6500 XT seems as it will only have a PCI-Express 4.0 x4 interface. This has been confirmed on the ASRock website. This is basically like having a PCI-Express 3.0 x16 link or a PCI-Express 2.0 x16 connection and is definitely a step down from the Radeon RX 6600 XT which has a PCI-Express 4.0 x8 interface and the Radeon RX 6700 XT at has the full PCI-Express 4.0 x16 interface.
It is interesting that ASRock is the only one that is listing that the card actually has a PCI-Express 4.0 x4 interface. Gigabyte, ASUS, MSI, and even AMD do not have it mentioned on their product pages.
It is also worth mentioning that the RX 6500 XT is missing some other important features that are present on other RX 6000 series cards like H264/HEVC encoding and AV1 decoding. All of the missing features of the card were put together by 3DCenter: