Here are some links for WIN 8 customization
Customize Windows 8.1 Start Screens by Using Group Policy
Customize the Start Screen
Windows 8 Start Screen Customization with MDT
Follow the steps below
1. Create a new user account that you will use to customize the Start screen layout.
2. Customize the Start screen as you want users to see.
3. From the Start screen, open Windows PowerShell.
4. At the Windows PowerShell command prompt, enter the following command:
Example: export-startlayout –path .xml -as xml
Consider the following scenario:•You install a Microsoft System Center 2012 Configuration Manager Service Pack 1 (SP1) primary site server.
•You use the Install Application task sequence step to install two applications by using the Install applications according to dynamic variable list setting.
•You create a deployment for the sequence and then deploy the sequence to the target collection.
In this scenario, the task sequence fails.
Link to hotfix
(Windows ADK), which replaces the old WAIK and contains the updated User State Migration Tool 5.0 (binary version 6.2.8250). The new tool brings a long sought capability to the toolset: corrupt store detection and extraction. There are also various incremental supportability improvements and bug fixes.
Good article and is worth a look
Check out this article for more information on
1.USMT is not migrating setting X for application Y. Is USMT broken or is this expected behavior?
2.I am in the planning phase and have not yet tried, but will USMT migrate setting X for application Y?