If you are still running a previous version of MDT, you will need to upgrade to MDT 2013 in order to deploy these new operating systems and use these new features.
This guide will assume you are upgrading from MDT 2012 Update 1.
For the OS deployment, MDT uses Pn P calls to install the correct drivers.
However,there is a task named 'Inject drivers' where you can specify which driver selection groups get installed.
If you don't have many different models, you can just leave it at 'Everything', but as time you get many models or different operating systems, the selection profiles are very handy for keeping it all straight.
For the boot images and USB or DVD installations this keeps the size of media smaller since you are only using the drivers you need instead of all of them.
This process, including wait times, should not take more than an hour.
Updating the deployment share depends on where the drivers are going to be used.
The answer to number 2 is, If you are adding drivers to the boot image, then yes, update the share and regenerate the boot images (using selection profiles for the boot image drivers is advised), then, yes you will have to replace the boot images in WDS to use these new boot images.
Joseph Moody is a network admin for a public school system and helps manage 5,500 PCs.
He is a Microsoft Most Valuable Professional (MVP) in Cloud and Datacenter Management and blogs at Deploy