University staff and students will be able to opt-in to Google Drive some time during the week of May 14th. You will see a link to try Google Drive from within your Google Docs. This is not a forced migration to Drive from Docs, it’s simply an opportunity to try the new product.
Google are aiming to move to the opt-out phase in early June (tentatively aiming for June 11th). The rollout process is explained here:
Google Drive Roll-Out