The way I see it is depending on the speed of the 6900xt, nvidia will look to counter with a card 1% faster overall. I speculate that will be about 5% slower than 3090. They will release 3080ti at £1100, the premium over the 6900xt being the extra RT performance and dlss (although amd will have their own version, I have to think that it will be inferior and like nvidia, amd will take time to bring it up to the same quality).
I doubt the 3080ti will be faster than 3090 as that destroys the stack. I can't remember seeing a card with a lower number in the stack to outperform the one above. The 3090 is not the Titan. The box main slogan inside says something along the lines of "made by gamers for gamers".
They probably wanted the 3090 to be a titan, but knew AMD had a fast card. They couldn't risk them coming out with a faster gaming class card, so released as 3090. A faster gaming card would have to be called 3090ti. Which then starts the downhill of pricing, they would probably have to greatly reduce the price of 3090 and place the ti at the current 3090 price.