CHICAGO – Bears wide receiver Brandon Marshall has a pretty good idea about what his team’s offense will look like come this fall.

But asking Marshall to spill specific details about the new playbook is about as hopeless as trying to snatch a football out of his hands.

“Some of that stuff, you want to keep in house,” Marshall said with a smile during the Bears’ veteran minicamp this summer at Halas Hall. “The Green Bay Packers and Detroit Lions, we don’t want to give them too much time to prepare for what we’re trying to do.”