Leaking Shower valve - getting replaced, what else to look out for

My Delta shower valve started leaking from the valve down inside the wall ( we noticed the look only when a small spot appeared on the ceiling below the shower).

I'm having the valve replaced, but what else do I need to look out for?

Check the overflow and drain for leaks. If you are hiring a competent plumber, he should check that automatically. You could ask him to do it ahead of time, before he gets started. I'm assuming tub+shower combo here.