I would hope not. I would hope that the first person who was ready goes first. Otherwise, you could have one person continually pushed back in the line because there's someone else who has higher priority. That's thread starvation (or in the retail world a really pissed off customer)

Unless Resource Governor is configured, all threads have equal CPU priority and hence no thread should ever be able to jump the runnable queue (doing so would imply that the thread jumping the queue is more important)