We're staying there, too, in about 2.5 weeks!
I've stayed there twice now, and we were at WCC for lunch a few months ago, and I never have once looked around to see if facilities like this are available.
I do know that inside the lobby, next to WCC, there are some fairly large restrooms, but I doubt they have showers.
Also, I believe there are some restrooms near the laundry room, closer to the pool, but likewise I don't know if there are showers in there.
I could be wrong, but I don't remember there being restrooms right at the pool at WL like there are at the Poly. It seems like the only location that might possibly have restrooms would be at the back of the pool bar, but it's hard to imagine fitting a shower in there.
I'll be sure to look when we're there in a few weeks.
