There are no plans for Sparrow (alone) to be put in anywhere. The WDW version calls for a replacement of the last scene of the attraction (something you don't have in Disneyland) called the "looting the treasury" scene. It would be converted into a cave scene with treasure all around, and Jack and Barbossa sword fighting in the moonlight.
In California, you have Jim Hill's plan... the day/night switch. And if that takes place, you won't find Jack in the normal ride, he'd only be in the night version. However, I highly doubt that you'll ever see Jim Hill's plan. It's too expensive, and as great as Matt is over in DL, he doesn't have say in all the budgets... so the only way you're gonna see this is if the Space Mt. night version proves popular. Which, by the way, is a pathetic attempt to add the Rock 'n' RollerCoaster to Disneyland at night... Yeah, we'll see how it goes. Heh heh.