Nothing official yet. This is one possibility, but the planes could also stay parked or go to another airline.
Honestly, getting those airplanes back now would create a mess. We can't even come close to staffing the airline now, let alone with an instant 15 additional airplanes. The seniority list has shrunk since the 15 airplanes were parked, and we were already understaffed considerably then. The junior-manning and extensions would be wide-spread if we got back airplanes.