Many models get renamed trim levels. Others get a few less trim levels. The QX50 is all-new and introduces an entirely new type of gasoline engine... see all of the changes for the 2019 Infiniti models.
Sometimes all-new is a shocking revelation. Sometimes it isn't. You have to read this review of the new 2018 QX80 to find out!
All of the 2018 Infiniti model changes in one place! So far: Q50 refreshed, Q60 with new trim level names, Q70 now called "LUXE," QX30, QX60 drops hybrid, QX70 discontinued, and an all-new QX80 coming.