As per the tipster, who has also sent us the blog post link, Lumia devices that received updates were not dev preview enabled and now can create Live Folders and the extra+info for them shows Lumia Denim as the firmware, post update. This combined with the official O2 blog announcement may mean that Lumia Denim roll-out may have already begun, even before late October to early November timeline that we came to know from our sources.
Now, coming to the tip’s validity, it is not accompanied by any screenshots and we have asked the sender to provide us with screenshots. In case, it is valid and your O2 Germany device has also received Lumia Denim update, feel free to share with us.
Visit our dedicated page to read all about Lumia Denim + Windows Phone 8. update 1