Infiniti sales in the United States have declined, but Nissan is not giving up on the brand.Nissan plans to expand the Infiniti portfolio with fresh products, including updates to QX60 and QX80 models.A new QX65 crossover-coupe and a fully electric SUV derived from the Vision QXe concept are also in the works.Nissan aims to speed up new car development, finalizing future models in shorter timeframes.