If you're using a staging server to test your Wordpress changes then you'll be deploying Wordpress to a new domain once your test team gives the go ahead.
Unfortunately this can break Wordpress quite badly. All the links in your content are essentially hard coded into the database content table. There are settings in the options table that help Wordpress with deciding on redirects.
Here are three useful sql statements that will make your life a little easier when migrating. You can include them as part of your scripted deploy or just run them manually if you don't deploy Wordpress often.
Edit them to suit your domain configuration, but they'll help you to change the links and settings in your database to point to the new domain.