Hi,
I have also applied to both for Secondary English, although I applied slightly earlier in November. What subject have you applied for? I know that Strathclyde are much quicker in giving out interviews and offers than Glasgow (I was offered a conditional place less than a week later after my interview). I had an interview for Glasgow on 8th January but haven't heard anything since, and I know that some subjects, such as Business, have later interview dates.
Good luck with you application!