Congrats! I just received a call from UChicago as well - from neurobiology. I'm not sure if the other neuro programs there are done looking at applicants yet. Also, the call was from a faculty member so some may simply call later. To anyone waiting, hang in there! I was told the official invitation emails should go out next week.
Also, it appears that MIT professors are conducting individual pre-interview interviews in the next couple weeks (before they extend any official invitations) since they received so many applications this round.
Best of luck to everyone! I hope you guys finish up finals strong too.