It varies. You can see most of Jeff Carter's arsenal on his website. Most of his equipment has one of two layouts. Others use layouts specific to the reaction they're looking for, and if you look at all of their equipment at one time, you'll see a dozen layouts. WRW uses mostly stacked layouts with the pin around 4" from his PAP.
For the most part, you see a lot of layouts with the pin 5" or more from axis, very weak layouts. Since the lanes they bowl on have very strong backends, they need length more than reaction.
Are there special layouts they're privy to that we aren't? No, not really. The ball reps on tour are very knowledgeable and come up with some unique layouts for specific bowlers' reactions (the Pat Girard layout, the Rico layout) that you won't usually see in most arsenals. But they're not "secret", they're simply uncommon.
SH