In the last month the Surface Pro team have started releasing driver and firmware packs that include all on the drivers and firmware required for Surface Pro. This pack is a simple zip file that contains all of the drivers as INF files that can be installed with out requiring an executable, which for those of you that have followed my previous posts will know is the way I like to see drivers provided.

Firmware Deployment

Perhaps the coolest thing about this pack is the fact that it includes firmware that is delivered in the form of a driver package. This is possible due to a UEFI feature called capsule packages. These capsule packages can be installed several ways:
Published via Windows Update
Injected into an offline Windows image
Installed into Windows 8 online

Note - They cannot be installed via Windows Software Update Service (WSUS).
Deploying Drivers and Firmware to Surface Pro - The Deployment Guys - Site Home - TechNet Blogs

A Guy