It’s Christmastime in Philadelphia. Our long regional nightmare of watching the Phillies while speculating about the 76ers and Flyers now segues to our most satisfying activity as a sports-obsessed populace: speculating about the Eagles while watching them practice. Quarterbacks, rookies, and select veterans will report to the NovaCare Center on Monday morning for the start of training camp (generic veterans apparently require a few more days of rest), and over seven weeks and through four preseason games, those who root for or cover the Eagles will seek out the new, the different, the encouraging, the discouraging as the regular-season opener, at FedEx Field against the Redskins on Sept.