WHAT IS IT? The saga behind the 2006 breakout series “Heroes” will continue this fall as creator Tim Kring returns to the fold and develops new layers to his original superhero concept. This highly anticipated 13-episode event series will reconnect with the basic elements of the show’s first season, where ordinary people were waking up to the fact that they had extraordinary abilities. Original cast member Jack Coleman will reprise his role as H.R.G., Jimmy Jean-Louis returns as The Haitian, and