Little is left for the GeForce GTX 1660 Ti series to be uncovered, one of the last AIB partners has now seen it's two primary card series leak online. ZOTAC seems to be working on two models for the new product launch.
The GTX 1660 Ti from ZOTAC will be available in at least two models, AMP and Twin Fan. The cards are dual-fan and dual-slot based. They'll get an 8-pin power connector. The cards leaked through videocardz are rendered, however.
ZOTAC GeForce GTX 1660 Ti Series Renders online