Are you asking about the RT version of the Surface or the Pro version?  I would assume that if Windows 8 was supported by PGP than on the Pro version it would just work?

There would probably have to be a specific version of PGP for ARM for the the RT version of Sruface.

I would love to see a PGP/Symantec Encryption RT/Metro Windows 8 app but my primary concern was whether the Surface Pro was supported.  From what I can gather it looks like Symantec is not supporting PGP encryption on any UEFI devices and since the Surface Pro is using UEFI I'm assuming that it would not encrypt successfully.

Symantec Corporation does not have Windows 8 support for PGP/Symantec Encryption Desktop products yet. This may come later this year. Please subscribe to:

http://www.symantec.com/docs/TECH199095

To stay informed on this.

Note: Touchscreen tablet support at the preboot screen won't be available for some time (on Windows 8 or not) with regard to Drive Encryption. This is due to a requirement of drivers to use this. So that is another limiting factor that I see currently to use the Surface Pro tablet with PGP.

Note: You could still use an USB keyboard or the surface pro docking station (with the keyboard) as a workaround.