Most unfortunately, not until 2006.
China Eastern is allegedly working eagerly on oneworld ties. Nobody seems to object, but computer systems are out of sync. No date given.

As for AY, I was curious and tried their MD-11 HKG-BKK. Verdict: you get what you pay for. Old, soft seats, a bit wobbly, decent cabin design, but NO comparison to CX. I would never chose them long-haul over CX in the current configuration.