Agreed, it was actually down for technical difficulties when I got to the park today, after trips on Mummy, MIB and the front row of Hulk, it was up and running.
Just know that this is NOT always the case. Some days, it does not make it back up before park close. This seriously is a normal breaking in process and the entire point of a soft opening, so it's really nothing to worry about - but if you're planning to go there JUST TO RIDE ROCKIT it's good to keep in the back of your head.