I got the secondary for UK about a month ago, but I am just getting ready to send it in today (it was so much work!!). They don't tell you your interview date until you fill out the secondary either, which is always a bummer. UL sent me some form to fill out about residency and they also wanted a check for $50 buckeroos. Apparently this is just so my application is complete - it doesn't mean I have made it to the next level in any way. UL said they had a overwhelming amount of applicants and that is why they are taking a little longer this year. Seems like it's the same story for everyone - so many people, so little time.
Anyway, hope this helps. Good luck!