Leaked specifications of the HP ZHAN 66 Pro 14 G2 laptop reveal NVIDIA has a GeForce MX250. This unreleased part is an optional feature of this HP ZHAN laptop, it has 2GB GDDR5 memory and is a low-end discrete graphics solution.
Other features of the HP ZHAN 66 Pro 14 G2 include an 8th Gen Intel Core i7 or i5 processor, a 14" screen, up to 512GB SSD or 1TB HDD, up to 32GB DDR4, and a weight starting at 1.6kg.
VideoCardz predicts NVIDIA may introduce this card at CES 2019. The site says it's unknown whether the MX250 is based on Turing or Pascal, but there are traces of TU107 and TU108 parts out in the wild.