Qualcomm interview questions

So I am not actually through the entire interview process. I submitted my application and within two weeks I received a request for a technical telephone interview. I passed the first telephone interview and had another one the week after that. I also passed the second technical one and now I will be flying to Boulder, CO next week. Does anyone have any insights on what may be asked and what I can study besides reading through glassdoor and reading the programming interviews exposed book?