So, Jordan Bianchi on the most recent episode of The Teardown podcast said that "from the conversations I've had with people" (his words, not mine), it sounds like there may be some interesting things happening behind the scenes at 23XI. He went on to say that he wouldn't be shocked if Kyle Busch ended up leaving JGR for them. He says this around the 44:50 mark on the podcast.
Obviously there's not much of anything to work with, but Bianchi does mention that 23XI seems more willing to open up their pocket book than most other teams. He cites the team being built around Bubba since pretty much it's inception, as well as them signing on Kurt Busch and Reddick as evidence of this.
Personally, even though I do root for the team, I have a hard time seeing such a signing happen. I think it's still much more likely that Kyle ends up at SHR. In particular, even though I know nothing about their working relationship and have absolutely nothing to go off of, part of me thinks that Kyle wouldn't exactly be eager to be under Hamlin's thumb. But if Kyle were to end up at 23XI, I'd say it would instantly become one of the most eclectic teams on the grid in terms of personnel.