I think you'll find it depends how you set the trem up. On my strat, it's set flush to the body so I can only drop it down - I can't pull up. With the bridge set how it is in the pic you'll be able to raise the pitch as well as drop it.

It may not necessarily be a problem, but hopefully LATS or Asch will be along soon with a more confident answer. I'm pretty sure you don't need to panic though - as long as the tuning is fairly stable and it's not set so that you break strings all the time raising the pitch, it's all cool....

If you want to drop it down, you'll need to take the trem cover off and possible add a spring or tighten the claw screws to the body. The fender site covers this here - hope that helps dude...