So what they've done is renamed everything (Titan Xp -> 2080 Ti, 1080 Ti -> 2080), added two new features (DLSS & ray tracing), and bumped the price up. Sad times.
This was supposed to be the generation that brought 2160p60 gaming to the masses but no, the barrier to entry is identical, unless of course DLSS becomes widespread, in which case "sort of" 2160p60 will probably be possible with an RTX 2070. That's not terribly helpful though given the 1080 Ti is currently cheaper and faster.
Err no. The 2080Ti is a replacement for the 1080Ti not the Titan Xp. There is no Titan in this lineup. If there was it would probably have the same number of cores enabled as the quadro RTX 8000 and have 24GB of GDDR6. The 2080 is a replacement for the 1080. The 2070 is an oddball as it's not a cut down 2080, doesn't support multi GPU and isn't as good as a 1080Ti. Prices are very high for each segment though.