I got an email and that's when I went to check my application. The email says:
Greetings from the Stanford MBA Admissions Office! We have reviewed your application and are delighted to invite you to interview.
The first step in this process is for you to let us know your location and general availability for the next few weeks. Please log in to your application. Click on "Update Interview Info" to let us know your interview preferences.
And then they have a Q&A saying among other things:
In Round 3, we are providing one option for applicants who would like to complete their interview while they are visiting the GSB campus. On Thursday, 23 April, alumni interviewers will be available in the evening to meet with invited applicants. This is the only option available to applicants who would like to request an on-campus interview.