This popped up for me for the first time (I haven't searched for *A award tickets on Asiana in a week or so)

"Restriction on Star Alliance Award Ticket Bookings Due to the Airline Merger Asiana Airlines is preparing for a merger with Korean Air in late 2026. Consequently, Asiana Airlines' alliance membership is scheduled to change from Star Alliance to SkyTeam. Please be advised that the Star Alliance partnership will be terminated upon the completion of the merger, and booking Star Alliance award flights will no longer be available.

To prevent any inconvenience resulting from this change, we are temporarily suspending reservations for Star Alliance award tickets for flights departing on or after December 1, 2026, as outlined below: 1. Restriction Details Subject: Star Alliance Award Tickets (Mileage Tickets) Effective Date: Flights departing on or after December 1, 2026 (Tue) Reason: Preparation for the termination of Star Alliance partnerships due to the airline merger and alliance change

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More and more official at this point