I have an interview April 23rd at Pikeville and I was just wondering if it is possible to still get in? YES
What are the chances? They aren't as good as they would have been back in August, but obviously they want you to interview for a reason.
What if they like me but the class is already full? They would probably place you on an alternate list, or some other possible option (whether it be SMP, admission for 2011, etc)
Is it possible for them to accept me for the 2011 class? Depends on the school and it's policies. Some schools are known to do that, but I do not know if Pikeville is one of them.