I picked up on a post on the Office blog about how Office 2010 will be activated.
It seems there will be 2 forms of activation in the enterprise space a “normal” enter the key and go online activation and an enterprise solution around something called the Key Management Service (KMS).
It seems that companies can install the KMS on a box somewhere on their network and then users who have volume licences can activate against this internal server. The added advantage it that this server can also licence Windows 7.
I am assuming that the carrot for larger deployments is that they get better and clearer management information on what licences they have deployed and can switch off redundant licences and use them elsewhere.
One BIG point to note is that an activation using KMS is only valid for 180 days so machines that use this mechanism need to be in touch with their KMS server within that time but I don’t see that as a deal breaker for 99.9% of scenarios.