As whispers of progress in U.S.-Japan trade talks permeate Wall Street's corridors of power, investors are greeted with a mixed bag of market signals and political posturing. Donald Trump hints at "big progress" in tariff negotiations. Amidst this backdrop, the premarket dance sees S&P 500 futures nudging upwards, Nasdaq futures leaping with cautious optimism, and the Dow Jones futures stumbling as UnitedHealth's financial health check reveals a prognosis that sends shivers down the spine of the healthcare sector.