GTX 1660 Ti officially released!
MSRP of $279 with performance basically the same as the GTX 1070.
It uses the new TU116 core which is basically the TU106 but without the ray tracing or the tensor cores.
Here's a FPS comparison between a bunch of GPUs running F1 2018 at Ultra High at 1080p.
The main problem with this card, according to the videos, is the pricing. For $279, the only 1660 Tis you can get are single fan cards. You'll need to pay $300+ for a dual fan 1660 Ti. But at that point, you might as well spend a bit more to get the RTX 2060 for better performance and the ray tracing and tensor cores.
On the other hand, one version of the Vega 56 has its price dropped to $250. Which means you could get the same performance as the 1660 Ti but for $30 less, although good luck finding that specific card since it seems to have basically sold out immediately and it doesn't seem to be a permanent price drop considering the cost of the memory chips it uses.
EDIT:
https://www.newegg.com/GraphicsCardsPromoStore/EventSaleStore/ID-506
I just checked Newegg and there's a few dual fan cards around MSRP, below $300. So those could be quite nice. But for me, I think stretching for the RTX cards would probably be better for future-proofing even though ray tracing and DLSS is very poorly implemented right now. But those are both software features which should improve over time. However, obviously, it's best not to make a purchase decision based on future promises.