There are no more slots available at HKIA. How can there be an expansion at CX? CX has around 40% of all the slots at HKIA. The latest I have read is that HKA is aggressively trying to get more slots, as they have only 10% and need more, by trying to convince HKIA to reallocate slots from other airlines to them.
On another note, every business and travel magazine is writing about potential flight disruptions in December for CX due to possible industrial action by the pilots. Wonder what effect this has on bookings ........