Cambridge interview dates have been out for a week or two. Oxford have sent out some rejections, but are infuriatingly late in telling you when you are wanted for interview. You may be panicking but the text below is taken from their website - you should hear any day now:
Have I been shortlisted?Towards the end of November or in early December you will receive an email or a letter indicating whether or not you have been invited for interview. Please note you may not receive this email or letter until a week before the interviews are due to take place. If you have been invited, the letter will include practical details of your interview and further information.
Please note that you will probably be interviewed at the college to which you applied, or the college to which you were allocated, if you made an open application. However, in some cases your application may be referred to another college. This can happen if a college is significantly oversubscribed for your subject that year, and will be made clear in the letter inviting you to interview. In some subjects all candidates will automatically be interviewed at a second college. For other subjects, you may be offered the opportunity to have an interview at a second or even a third college. This does not necessarily mean that you will not be offered a place at the first college.
And here's a link to the timetable again: http://www.ox.ac.uk/admissions/undergraduate_courses/how_to_apply/interviews/interview_timetable.html