According to reports from different sources, Windows 8 will feature OEM Activation 3.0 (OA 3.0).
OEM Activation 3.0 for Windows 8 was mentioned by sp3ciali5t, and Windows8beta managed to find a job posting from Microsoft which seems to confirm the versioning jump from 2.1 to 3.0.
From the job listing:
As OEM Activation 3.0 (OA 3.0) Named On-Boarding and Launch Program Manager you'll be working closely with the Lead On-boarding and Launch Program Manager in defining the launch approach and will be responsible for leading Operations implementation activities for Named OEM partners specifically. You must be customer and client centric, able to prosper in a dynamic and diverse international organization. You must be driven with a passion for customers and a strong desire to drive the successful deployment of this complex, business critical strategic initiative through strong program leadership, operational excellence, creation of business value and intensive focus on customer and client satisfaction.
We've added a screenshot of the job listing below, incase if MS removes the job page.
Users must already know that Microsoft offers a variety of methods for activating its Windows operating systems. One of them is referred to as System-Locked Pre-installation (SLP) OEM Activation, and is only available to original equipment manufacturers. Essentially, through OA, OEMs effectively bundle together a specific copy of Windows with a PC's motherboard.
Windows copies shipping on OEM machines are inherently tied to the motherboard, and cannot be moved to another computer. Even consistently upgrading an OEM PC can get Windows to claim that it's no longer genuine, with the changes made resulting in an overhauled machine being regarded as equivalent to a new computer.
Here's the definition Microsoft provided for OA 2.1:
Original Equipment Manufacturer (OEM) activation is a perpetual, one-time activation that associates Windows 7 with the firmware (BIOS) of a computer.
This occurs before the computer ships to the customer, so the end user or organization is not required to take any additional actions.
The copy of Windows 7 that the OEM installs on a computer is valid only on that particular computer, and it can be reinstalled and reactivated only from the OEM-provided recovery media.