What Dominican just posted is EXTREMELY important for any job in China. Go for the job for what it is, right now. Not for some promise of an upgrade, new rating, or new base in the future.

The job postings come from offers made by 21 year old office staff at the airline. They are holding a carrot in front of you to try to get you to bite.

Actually long term, foreign bases will most likely go away. Locals get a huge override to fly international (I believe Hainan is 100%). As soon as they have enough locals to fly those routes, your foreign base will go away or you will just DH to CAN to start your domestic trip. Most likely it will go away.