In my experience, it hasn't been. I've been looking since June for availability on the A380 O flights in October and it's non-existent (this is after the blackout dates).

KE's own award availability shows seats available for their own members but a lot of times, it seems these never get released to Delta.

I'm now also trying to leave earlier in September to go to Korea but I can't seem to find any A380 flights on any day in September. Does anyone know when KE will release seats to DL or is it just luck of the draw? I'm assuming with near 100 seats in Prestige, they've gotta open some up sooner or later...