For those of you that have already purchased a copy, it’s my understanding that your copy won’t automatically reflect the new cover.
From speaking with Amazon’s customer service reps, I was told that customers need to:
Compose an email and request for Amazon to update your device with the newest copy of this book. You will need to include the title or ASIN number: B0111CTC8G
They will then send out an update to your Kindle.
This is for the boxed set. At this time, the individual books still have the original covers.