The crafty cats over at WPDang are hearing rumours that Nokia could be set to announce their first Windows Phone 8 devices on September 5th. They are suggesting that the new devices may be called the "Lumia 910" and "Lumia 920". As ever, we suggest filing this under *rumour* but WPDang have a good track record on these things.
At the site, they are also hinting that September 5th could be when Microsoft reveal more details about Windows Phone 8. It’s good to keep in mind that the dev event where Windows Phone 8 was initially launched did not go into specifics of end user features or UX changes. There is still much to come.