In case you are also one of those Jolla users who have been checking for an update notification in system settings, you can stop doing that for now. Jolla just announced via their official Twitter account that the update will be out by early next week:
Sorry for the wait, we're still rowing upstream on the final stretch for update which will be out early next week. Thanks for your patience!
— Jolla (@JollaHQ) March 14, 2014