Towards the end of the video (see below), he removed the hoodie to reveal himself. The video includes footage that was shown in the Slammiversary video from earlier this week with several released WWE stars shown. The belief is that the man under the hood would appear at Slammiversary. Keep in mind that every main roster wrestler that was released in April is under a 90-day no-compete that will expire a few days before the Slammiversary pay-per-view. NXT wrestlers were under 30-day no-compete.
EC3 would be a good choice to appear at Slammiversary but bear in mind that this could just be his way to play into the rumors so nothing is confirmed until the mystery person actually shows up at the PPV.
You can click here to see the original commercial that aired earlier this week on AXS TV.