Another carrier is jumping on the "I'M READY!" wagon, this time it's France-based SFR. The above screenshot shows a detailed page about Mango (basically how to update handsets via Zune), however the "continue" link is pointing at Microsoft's Windows Phone website.
We recently covered a leaked Orange FR memo that detailed the 15th (now gone) as the roll-out day for Mango and how they are even possibly exchanging broken devices with preloaded Mango ones. While we've had a limited release of the update, it seems as though some carriers are still playing catch up for now. Let's not forget that "this fall" begins soon.