I love guessing games. I'll make a guess:
RTX Titan $1100
They're all going to massively outperform the 1080 and maybe even the 1080Ti so no reason to bring the prices down. Unless, that is, Nvidia has some sort of vendetta against AMD and wants to put them in the ground.
That 2080 Ti price strikes me as a bit steep as you can get the Titan for 1100. But hey, at least it's not over 9000!
Here's my guess:
Titan RTX: $1200
RTX 2080: $700
RTX 2070: $450
RTX 2060: ~$330
I'm interested to see what the 2060 delivers. If they can pull another 1060 and match the previous gen high end (e.g. 980, 1080), it would be interesting to see how AMD would react.