As I wrote here a few weeks ago, Peach is going to begin international flights.
The timetable was released to public
See the PDF of Peach's official website
http://www.flypeach.com/Portals/1/PressReleases/2012/20120209-Press-Release-J.pdf
Hong Kong/0:50→Osaka(Kansai)/5:30
Osaka(Kansai)/21:10→Hong Kong/0:05
Cathay Pacific has already had the night flight(CX566) from Hong Kong to Osaka
Hong Kong/1:25or1:35→Osaka(Kansai)/6:00
But, the night flight from Osaka to Hong Kong is rare.
The ploblem can be seen if we see the timetable of MTR(Subway company in Hong Kong).
Passengers have to be concerned about departure time of last trains.
If we estimate that it will take 30 mins from a boarding bridge to the platform of MTR station,
Last trains only for Hong Kong(0:48) and Asia World-Expo(1:13)
are available.