Hey,
I got an email inviting me to interview as well! When is yours?
I don't have a massive amount of information unfortunately, but I've spoken to someone at Oxford who said we can expect to be asked some technical questions, but also they'll ask questions to assess our suitability to our course. I'm expecting to be asked things like "Why computer science?", "Why a masters?", future career, etc. So kind of a mix between behavioural and technical. I was also told that it should last around 30 minutes.
Have you found any extra information?
David