I don't think that's a Thargoid. I've mentioned this on the Oculus reddit but there are two separate alien races seen here imo. There are two ships. The first ship 'does a Thargoid' and pulls you out of hyperspace and starts to attack the Commander. The second ship appears to resue the Commander from the the Thargoid ship.
Thargoids are indeed back, but it's looking like they're at war with another race which could make things interesting as far as PowerPlay and the behaviour of the Federation, Imperials and Alliance the last time the Thargoids were on the scene goes.