The new Exchange 2013 exams have appeared on the Prometric site.  They are:

Exam 70-341: Core Solutions of Microsoft Exchange Server 2013

Exam 70-342: Advanced Solutions of Microsoft Exchange Server 2013

If you pass the MCSA Windows Server 2012 exams as well as 70-341 and 70-342, this gives you MCSE: Messaging

As you can see from the links, these exams aren't released until January 2013 but you can use the information in the links to start preparing for your Exchange 2013 exams (unless you're involved in the beta exams of course).

Also, there are the following two Lync 2013 exams:

Exam 70-336: Core Solutions of Microsoft Lync Server 2013

Exam 70-337: Enterprise Voice & Online Services with Microsoft Lync Server 2013

If you pass the MCSA Windows Server 2012 exams as well as 70-336 and 70-337, this gives you MCSE: Communication