Check this link from Amazon.

You could see below information.

Training Kit (Exam 70-461): Querying Microsoft SQL Server 2012

Available for Pre-order. This item will be released on September 22, 2012.

Training Kit Exam 70-462: Administering Microsoft SQL Server 2012 Databases

Available for Pre-order. This item will be released on July 17, 2012.

Training Kit (Exam 70-463): Implementing a Data Warehouse with Microsoft SQL Server 2012

Available for Pre-order. This item will be released on September 22, 2012

We need to wait quite a while before these books are available.

For some inputs regarding certification, you could gain a lot from these articles written by Mike McQuillan[/url]