Preordered a couple of months ago, but I don't get it with their releases. First there were great big digipacks, during first 4 seasons, on DVD. Then they started making these pretty steelbooks, I've rebought the first 4, plus specials in them on BD.
Then, for S5-7, with the Eleventh Doctor, the best one could get, were digistacks (later re-released in steelbooks).
Later there were great big wide digibook collections, only bought The Complete Peter Capaldi Years for seasons 8-10.
Finally, for the hated woman Doc they went back to nice long digipacks with seasons 11 and 12, which is what I got. But S13 is a steelbook again? My Doctor Who collection is now all over the place, literally.