I guess the Disney lawyers are involved so who knows what
the timeline might be. Seems that worst case scenerio, which
means new over the shoulder restraints which may mean
all new ride vehicles, Splash could be down 9-12 months.
Hopefully it won't come to that, about the only way to get
hurt on that ride is to be stupid, negligent, and not follow
the posted rules. And even then you have to try and hurt
yourself.
I think they discussed this in one of the articles over on
Mouseplanet.