I was on the alternate list for 2 weeks and never got the "yes." I don't fully understand what it all means. Mine just had a dash under the alternate column and when I called, Gayle said it meant I had been waitlisted, but it never said yes, just hold. So I think you may have been waitlisted.
Either way, don't be discouraged, UCI is known to have a HUGE amount of wailist movement as it's not exactly many people's dream school. I can think of a couple of schools I've interviewed at that I would pick over UCI, and there are lots of other accepted people like me. This is going to guarantee waitlist movement. From the students I spoke to, very few were accepted right after the interview as UCI tends to put most people on the waitlist until March. Sit tight, I'm sure you're ok with such an early interview!