Expectations are high heading into Palantir's (PLTR) earnings, and Rob Luna has concerns about its outlook as valuations swell to massive levels. He says the company needs an excellent outlook to sustain its stock growth. Shana Sissel still expects Palantir to "surprise to the upside" based on earnings seen in the company's competition. Government contract revenue in the A.I. space is something Shana believes can lead Palantir forward, as long as it proves sustainable long-term growth.