The UK site was correct after all. iOS 4.1 was released today, along with HDR images, GameCenter, and a bunch of bug fixes. You’re going to want to check it out. I’m sure everyone’s updating right now, but the download isn’t taking too long.
If you’re running iOS4, you’re going to want this update asap. Just plug in your iPhone/iPod, click it in the sidebar, and click the update button.