My guess is similar dates for Nvidia - possible news sometime around end March or even April, with cards available may be May-June.
What is interesting for me is what AMD is planning. Its all quiet lately with the change in their tech department.
It would be pretty bad if ETH is gone for all the milions of AMDs, given the fact cryptonight is not that interesting lately as well.
AMD is concentrating on Bristol Ridge and second-gen Ryzen this year, they've stated they don't plan any new discrete GPU indroductions in 2018.
Nvidia - I anticipate their GTC confrence in late March will see Volta announced (same as Pascal 2 years back), not sure on availability but they can't AFFORD to delay Volta consumer cards very long unless they're going to ramp Pascal back up for a short bit to tide folks through.
The initial release will be Founder Edition cards, dunno how long it will be 'till 3'd party Volta cards show up (in THEORY it could be same timeframe, but past experience suggests "couple weeks to a month delay after the FE version of a particular GPU shows up" is more likely.
I would guess that pricing will be at least 10% higher on MSRP than Pascal cards if only due to the increase in RAM pricing in 2017 - and won't be shocked at a 15-20% jump in some cases.
ETH - will be around a while longer as mineable, but I can't find firm information on the current "anticipated timeline" for Casper introduction. Probably a year more or less at least to go.
The Titan Xp "Star Wars" cards were in stock 'till Friday or Saturday last week, then Nvidia made some "regular" Titan Xp cards available early this week - but those seem to have dried up already.
Titans are pretty close to the 1080 ti on mining - the 1080 ti is basically 11/12ths of a Titan Xp across the board after all.
They're Founder Edition designs, so they should have pretty much the same thermal curve as the 180 ti FE cards.
Based on the Titan V benchmarks, I'm anticipating 20-30% performance jump over the "equivalent" Pascal cards at the same power consumption, or some mix of "lower power" + "not as much performance gain".
Might vary with the specific model, and they might not try to "match" the Pascal models with the new models - if nothing else, they need to CHANGE that deceptive 1060 naming where the 3GB card is NOT the same GPU as the 6GB card (it's a cut-down version, one CU disabled or some such).