Don't get too excited - the initial service is only thrice-weekly, so availability for A and D classes will probably be very limited.

There is speculation in the press that Cathay really wants to use its new route rights in China to blackmail Dragonair to codeshare on its flights. Apparently CX can make more money that way. This would be bad news (OWE tickets are invalid on codeshare flights), unless of course Dragonair also joined OneWorld...