I have uploaded the latest versions (dated 14 November) as published by CX in for tickets originating in HKG here.

They don't include the pricing issue since they are just for ticketing in and travel ex-HKG with the HKG prices.

They do specifically say that changing, for example, LHR-JFK to LGW-JFK carries a US$125 fee. I still see nothing that says I can no longer ticket LON-NYC and use it on either route.