I received an interview invitation from UChicago on December 22 from the chairs of the admissions committee. The included a survey to select which track you had applied for, options of Computational Neuroscience and Neurobiology. The interview is two days of the first week of February. Not personalized at all, but I'm not sure if those were all of the invites, although they are finalizing the interview schedule this week they said. Hopefully thats helpful!