It appears that Splash goes down for refurb every January, sometimes into February or March. The one recent exception was 2012, when BTMRR was down for an extended refurb and they left Splash open.
I really had my fingers crossed that since last year's Splash refurb was a long one, this year's would be short, but no such luck. I think I'm going to have to find another time of year to go if I ever want to ride Splash again.