Not hearing anything from any credible sources at this point about OC candidates. There has been lots of speculation about Gino Guidugli, the QB coach at ND who was Cincinnati's OC in 2022. The interesting thing about him is that Notre Dame's QB room is loaded. The backup this year has been Steve Angeli, but they also have CJ Carr, Kenny Minchey, and Tyler Buchner (who was their starting QB as a soph in 2022, but then got hurt and is backup WR/special teams this year).
Carr had some interest in WI, and if he's stuck behind Angeli and Minchey maybe he might come with Guidugli. Or, maybe Buchner wants one last shot at QB for his last season of eligibility.