It's about a bear who escaped a lab whose experiments made him “smarter than the average bear” as he tries to survive in the wilderness (That he’s only now seeing for the first time) by eating camper's leftovers. All the while constantly evading the relentless Ranger Smith, a corrupt park official hired/bribed by the lab to track him down, capture, and return him.
Benicio Del Toro will be the tortured anti-hero Yogi Bear.