This is CNBC's Morning Squawk newsletter. Subscribe here to receive future editions in your inbox. Happy Thursday. My spin class soundtrack of mainly Kesha's music last night was more evidence that the 2016 aesthetic is back . Stock futures are lower this morning. The three major indexes are coming off a winning session. Here are five key things investors need to know to start the trading day: Shares of Walmart slid more than 2% in premarket trading this morning after the company's guidance for