A lot of us have subscriptions to ExpertFlyer to keep up on flight details. Gives you detailed information on "seat buckets" (how many seats available per booking code/class) available and upgrade probability. Zeroed out means all of the buckets, for example J (business) goes from J7 (7+ available seats) to J0, and all other buckets are also 0. It's a way in their system to not respond to flight searches for new flights. Essentially they are making the flights appear as full so they can't be booked, and eventually they will be cancelled once they figure out their schedule and push out a new one.