Unlocks at 5 stars
Requires 5 Bounty Hunters to unlock
For 7 stars - Gear 8 minimum. Recommended Gear 12+ but can be done with less. Bossk leadership recommended, can be done with Boba Fett as leader. Dengar is also recommended.
Panic Farm Calculator
Content Update brings Chewbacca Legendary character [Link]
Bounty Hunter bonus drops are being added to help with preparing for Chewbacca [Link]
Chewbacca officially announced