Salesforce.com version Spring ’14 has been delayed for instance version NA7 in some cases. There have been multiple issues with the version, related to performance and functionality. You can expect to see the future release date announced no later than Thursday, January 16, 2014, at the following link:
The email from Salesforce:
At salesforce.com, ensuring customer success through trusted system availability, performance, and reliability is our top priority. We’ve made the decision to postpone the rollout of Spring ’14 to your NA7 instance with these priorities in mind.
We have identified open items related to the performance and functionality of the Spring ’14 release and are working around the clock to identify, test, and apply fixes for these issues. To give customers the best possible experience with the Spring ’14 release, we are rescheduling the release to complete additional testing.
We are in the process of finalizing the new Spring ’14 release upgrade window for your NA7 instance and will be able to share that schedule no later than Thursday, January 16, 2014. This information will also be posted to http://www.trust.salesforce.
We appreciate your patience and apologize for any inconvenience this change may cause for you or your organization.