That really depends on how much of a % uplift we see from Ada, followed by how much this expensive vram seems to be. If they are not being greedy, you could see the FE pencil in at £699 although I would second @Cooper prices if the modules cant be stingy again.
Of course, the launch price will be pretty much irrelevant for the vast majority of people who will want one, given that they will likely be almost impossible to actually buy for the first 6mths or so after release.