A small electric SUV, the Optiq joins the Ultium family of GM EVs that includes the Blazer EV, Equinox EV, and Lyriq Prices start in the mid-$50,000s—and the Mexico-built Optiq should qualify for tax incentives Cadillac promises fully-charged driving range of about 300 miles Cadillac has revealed an entry EV for the GM luxury brand that…