I would think that with the looooong lead times required to research the aircraft of interest, initial design of a kit for such aircraft, reiterations and changes necessary to make it a reasonably buildable model with sufficient accuracy and minimal brain damage to the modeler, test runs of the mould and parts quality, creating the instructions that have to actually represent the model in its final form, final production test shots and QC build exercises, it would not be a good idea, or feasible, to announce in advance.