New CX boarding procedure: 3 lines
There are now three lines (at least for the HKG - ORD flight I took): one line clearly labeled "First Class/Diamond/Emerald", another line next to it labeled "Business Class/Gold/Sapphire" and the Economy line.
When boarding started the "premium" side take the F/DM people first, and the "Econ" line would take the J/GO people, and as soon as the F/DM line ran out of people, the J/GO line get redirected to Premium side and they start to take in Econ pax.