Last year was on CX714 in J class (redeye flight) during the year-end season. At the gate holding area, they were making announcements for passengers who were willing to give up their seats to take the early morning flight next day. Heard they mentioned about providing a night hotel stay. Not too sure what else was offered.

Not too sure if anyone took up the offer but ultimately everyone was able to board the plane and was full in J class.