Apple Product Design Engineer interview questions

I had an initial phone interview with a recruiter, who talked to me for about 10 minutes about my resume and the open position, making sure I was a good fit. After that, he scheduled a phone interview with the hiring manager. He told me to be ready for some technical questions. A few days later I had the call with the hiring manager, and it was mostly focused on explaining my previous experience and how I would fit in with the job requirements. We talked about some technical aspects of the job, but not very in depth. Most of the interview was actually a back-and-forth where I was asking questions about their engineering process, work culture, etc. It was a good discussion and I left it feeling pretty good about my prospects. The manager said he would be talking to a few more candidates and I would here back in about a week. He said the next steps would be to have me do a "design challenge", present it, and then take a trip to Cupertino to do a series of interviews. However, two weeks went by and I did not hear anything. I contacted the recruiter to ask him about it, and he told me they had decided to hire someone with more experience.