We were just on Casaval on Thursday (5/13). First time I've been on the route, so I'm not sure what the typical conditions are. Going through the hourglass, it was unconsolidated powder on top of loose rock (we went up the right side). The catwalk seemed a little thin. You could walk across the beginning of it without any trouble. The middle (where it's heavily wanded) was pretty thin, we front-pointed and daggered our way across the most exposed portion. It then went back to decent coverage for the exit.
Mountain was empty! There was only one other group up there, and only one of them summited. Took us 8 hours from our camp to summit, and another 4 hours to get down via Avalanche Gulch. We managed to glissade almost all the way from the Red Banks to Lake Helen.
Good luck!
Doug