The Key's from MS good till: January 15. 2014 And I guess that applies as well for the Windows 8.1 Preview Key's
I suoppose there will only be gVLK key for Automatic Virtual Machine Activation (AVMA) Key for Datacenter Server (surely there would not be SLP OEM one for that...) Which might (or not) work with current v5 of KMS sebus
Gotta give credit where it's due.. from those screen shots - seems like they taking a step in the right direction... Gonna test this one out and get a feel for it...
It's possible to generate valid GLVK keys with the KeyInfo utility. The GroupID is 1336 and the valid KeyID range is 1000000-999999998 (taken from pkeyconfig). The secret parameter can be anything, as it isn't validated.