This is CNBC's Morning Squawk newsletter. Subscribe here to receive future editions in your inbox. Happy Wednesday. It's also April Fools' Day, so be wary of those too-good-to-be-true company announcements today. Stock futures are rising this morning. The three major indexes staged a big rally yesterday, ending their tough month and quarter on a high note. Here are five key things investors need to know to start the trading day: Stocks recorded their best day since May yesterday after an an