I watched Rix Flix (Universal Studios Orlando youtuber) who made a new video about things he has heard so far for this year's HHN30 event. In the video he mentioned he heard Jack will be returning this year but he also mentioned Bill and Ted too. He said at the end of last year's HHN29 he was told there was a 90 percent chance Bill and Ted would be back this year since they are coming out with a new movie this summer before HHN30 so everything was adding up to that. However, then he also said he talked to someone else recently and they told him comcast the parent company owner of NBC Universal and Universal Studios and all the resorts and themeparks were really not fond of the "raunchy" nature of Bill and Ted. So, he has doubts now that it will return for HHN30.
P.S. I want to also mention of course it could still be coming to the event though. We just have to wait and see.