Apple has introduced the possibility of deleting an app. Quoting the iTunes Connect guide:
If you have created an app in iTunes Connect that you no longer need to see or manage, you can delete it from your iTunes Connect view. Deleting your app will not allow you to re-use your SKU or App Name and you will not be able to restore your app once deleted.
So far so good. Then it gets slightly confusing:
If you are selling your app to another developer for their own distribution and need to remove it from your iTunes Connect account, we recommend that you use App Delete so the App Name will be freed up for their use.
Does this mean that I won't be able to reuse the name in my account, but other accounts will? Has anybody tried this?
Please see Removing an App From Sale (page 92) section on iTunes Connect Developer Guide 6.3
After removing all assigned territory checkboxes from your app in the Rights and Pricing section,, the status changes to Developer Removed from Sale and your app will not be seen on the App Store within 24 hours.