1. They just were not mentioned yet, and are going to be apart of this wave.
2. They are being held for a later release with more flying vehicles for what has been mislabeled the "Autumn of Flyers"
Personally I don't know which it is, and I am going to ignore the idea that they are just not going to be done anytime in the near future. I would like to think that the rumor is yet another indication that we will be seeing a big flyer release coming up sometime right after 6th edition, however that is rather speculative. I suppose only time will tell. We should start seeing information this coming weekend on what May will bring us.
The picture above just cracks me up. I beleive it was taken by Weirdboy.