Round 1: Video interview. Answer 3-5 behavioral questions. All of your subsequent interviewers have access to this file.
Round 2: Phone interview. Interview with a technical manager in your field. Very basic questions about how you've overcome challenges in the past and your projects/internship experience.
Round 3: On-site interview in Lexington, KY. The first day is a dinner with current engineers in the company and an introduction to the program. The next day starts with a tour of the facility and in the afternoon are interviews. I had 3 panel interviews with two people each: one hiring manager and one former TRP. The questions were 30 half technical and half behavioral. They changed the interview process to contain more technical questions than previous years.
Note that although the program is advertised to recent graduates, many of the candidates were graduate level, not undergrad. This was surprising to me, and I felt that this put me at a disadvantage, as I was the only undergrad for my specialty.