With Wall Street's surge to record highs, the U.S. stock market looks nearly as expensive as ever, and investors are debating whether the lofty valuations are a bearish signal or justified by the technology-heavy market's profit outlook.

Tuesday marks a critical day for earnings, with JPMorgan Chase, Wells Fargo, Citigroup, State Street, and BlackRock all set to report before the opening bell. Wall Street is hoping a strong showing from financials can sustain the market’s momentum.