The purely gasoline-powered Lexus RX350 line doesn't get the same deep discounts for 2018. They actually increased in price, but only slightly. Normal RX350s, both front- and all-wheel-drive, are $50 more this year. The same goes for the F Sport versions of the RX350.
The RX line also will get a new longer version with a third row seat. Pricing has yet to be released for the longer vehicle. But we know it isn't higher or lower than 2017 since there wasn't a long version that year.