Nokia Conversations has put out a video showing you how & why to update your current WP7.5 device, they say the rollout is starting today & over the next coming weeks. A message should appear on your phone telling you there is an update, I would connect my phone to Zune , Windows Phone App on a Mac or manually check to see if there is an update. Hopefully yours comes today.
Check out the Video Below.
Remember : Delivery of the update is operator dependent, meaning you will receive a notification in the coming weeks if you have an unlocked phone or if your operator has approved the update. If you don’t receive the update notification within the next three weeks, please contact your operator for more information.