Just got the word from my friendly neighborhood LEGO Shop@Home Affiliate Rep:

Unfortunately, as has been called out, the pre-production label included a typo and therefore made it into the production photos for this product, but rest assured that the actual label contained within the box will be accurate.

Corrections will also be made to the box and instruction art, but will happen in, “running production” which means initial product (most of the 2011 run) will still be packaged in boxes and with instructions that contain the ‘typo’ photo. However, these sets WILL contain the accurate plaque label.

10221 Super Star Destroyer Executor will be available starting September 1, 2011 for $399 USD.