romerogames[.]ie/sigil
thurrott[.]com/xbox/194950/john-romero-to-release-free-new-levels-for-original-doom
There are promo packs that can be pre-ordered now from the romerogames site. Sigil will only work with licensed copies of the original game, so you've got until mid-February 2019, when the megawad's released, WR, to find your old key.
