Hi pvrao,
Microsoft will be rolling out the service upgrade over the course of 2013,For more details, please refer to the link below:
Office 365 Service Upgrade Center for Enterprise
http://community.office365.com/en-us/wikis/office_365_service_updates/office-365-service-upgrade-center-for-enterprise.aspx
Office 365 Service Upgrade Center for Small Business
http://community.office365.com/en-us/wikis/office_365_service_updates/office-365-service-upgrade-center-for-small-business.aspx
Thanks,
Aaron Yuan