What happened: A.J. Brown arrived in New England through an offseason trade and is preparing for his first season in the offense. He said July 28 that he had learned 90% of the playbook.

Why it matters: A target-heavy role would place Brown at the center of the Patriots' effort to expand their passing attack. His adjustment to the system will shape how quickly that plan takes hold.

What to watch: Brown's preseason usage will offer the next indication of how prominently New England plans to feature him.