Microsoft just released its first system update for the Surface Pro. Unfortunately, the much-needed pen driver fix for pressure sensitivity in Adobe Photoshop is not included in this release.
From the official Microsoft site, today's update corrects the following:
Fixes to Wi-Fi reliability allowing for better roaming and improvements to "Limited" connectivity scenarios. Windows To Go feature is enabled. Improved onscreen keyboard detection synchronization when going in and out of sleep.
The Windows to Go feature allows users to run a Windows 8 Enterprise image off of a flash drive. Learn more about the feature here.
To install your March update, go to Settings, Change PC Settings, Windows Update. Assuming you haven't changed the defaults, the update should already be downloaded and awaiting a restart.