sorry for my bad english but i\'m italian.
I have to release an app that will work on only a few devices. What should I do when the provisioning profile expires? Will th
Not sure what you're really asking, but here is a quick answer with some points that might help you.
Ad hoc provisioning profiles last for 1 year. After a year the certificate is invalid and the application won't work any more. At this point you will have to create a new certificate (usually just renew the certificate will work) and re-release built against the new certificate. This will mean that anyone using the application this way will have to remove the app from their device and install the new package you send them.
When you release an application on the app store the certificate is permanent, you don't have to renew anything and apple will deal with it itself.