Later today, Discovery Communications will host its annual Upfront Presentation in New York City, giving clients and media a first-look at the new and returning series across our nets. As usual, we’ll have a diverse, star-studded lineup — from Kal Penn of Discovery Channel’s The Big Brain Theory: Pure Genius and TLC’s June Shannon and Alana Thompson from Here Comes Honey Boo Boo to OWN’s Tyler Perry and Investigation Discovery’s Tamron…