Not 100% yet, but if I were to give an exact date off of what would make sense and what I was told, I’d say announcement Tuesday, June 23 at 10AM PT, and reservations Tuesday, June 30 at 10AM PT
To quote exactly what my source said; “They’re allowed to post videos after June 23”. Going off of Steam Controller’s announcement, the review videos were put out the same day as the announcement.
Might be worth it to check here June 22-23, if not then another day between June 22 and July 1, but this is what would make the most sense considering the embargo.