If you pass one of the beta exams, the exam credit will be added to your transcript and you will not need to take the exam in its released form. The 71-xxx identifier is used for registering for beta versions of MCP exams, when the exam is released in its final form the 70-xxx identifier is used for registration.
By participating in beta exams, you have the opportunity to provide the Microsoft Certification program with feedback about exam content, which is integral to development of exams in their released version. We depend on the contributions of experienced IT professionals and developers as we continually improve exam content and maintain the value of Microsoft certifications. The following exams are a part of this beta offering.
Exam 71-511, TS: Windows Applications Development with Microsoft .NET Framework 4
Exam 71-515, TS: Web Applications Development with Microsoft .NET Framework 4
Exam 71-513: TS: Windows Communication Foundation Development with Microsoft .NET Framework 4
Exam 71-516: TS: Accessing Data with Microsoft .NET Framework 4
Exam 71-518: Pro: Designing and Developing Windows Applications Using Microsoft .NET Framework 4
Exam 71-519: Pro: Designing and Developing Web Applications Using Microsoft .NET Framework 4
Read more about these new beta exams here @ Borntolearn.