According to ADB's facebook page, that particular story is slated to be an audio-drama.
Yes, but it would be later - as a separate title. As you could see with their releases this year (each novella or short ) will be getting an audio treatment. So, we will see.
Fulgrim image is that it is part of a Daemonic Fulgrim novella that is a part of the next HH novella anthology. Legacies of Betrayal
Yeap - and i thought that myself, after the HH Weekender. But something has changed since when. Maybe McNeil can't finish it in time, or something else - i don't know. But it is not a part of Legacies of Betrayal anymore. It seems his story was replaced with Gav's Cypher story