These guys don't have the best track record when it comes to the rumor mill but I think we can all agree this would be pretty cool.
A hybrid cooling solution attached to an external 120mm radiator with a single fan are not the only changes in comparison to the vanilla RX 6900 XT model. The RX 6900 XT Liquid Cooled SKU features higher clock speeds as well as increased TBP to 330W.