We will be upgrading clients to the latest version of WordPress automatically starting Tuesday June 26th 2012. Remember that you can use the WP Engine Staging feature to test out the upgrade before hand. Always make sure to make a backup if you are planing to upgrade yourself. Information on how to do that is at this link .
If you do not wish to be upgraded, please contact support by filing a ticket at the WP Engine Ticket System with your concerns and questions, but please be advised: As a managed WordPress Hosting Provider we do require everyone to be on the latest version of WordPress. We will not allow anyone to be on a old version of WordPress.
If you have any questions or concerns, please do not hesitate to contact us.