White Rabbit is something that WWE has been teasing for almost a month now. On the September 16th edition of SmackDown, WWE played Jefferson Airplaine's White Rabbit song during commercial breaks. Also, the song was played during that weekend's Live shows accompanied by red and purple colour lights.
Since then, WWE has been teasing them more frequently with the help of QR codes. During many shows, WWE has been subliminally displaying QR codes on the screen during RAW and SmackDown. The code generally shows us a game, location or video. Everything is leading to someone's return.
The entire WWE Universe has been speculating that this could be Bray Wyatt hinting his return. Wyatt hasn't been seen in WWE since his lost against Randy Orton at WrestleMania 37.