Hi Haydn,
I understand you have concerns about Office 365 service upgrade. We will schedule your service upgrade in 2013, and let you know by email two to three weeks in advance. We'll inform you of the exact date a week beforehand. We'll email you when the upgrade is complete. Therefore, please wait to be scheduled.
For more information, please refer to the article: http://community.office365.com/en-us/wikis/upgrade/office-365-service-upgrade-center-for-enterprise.aspx
Thanks,
Nate Cui