The conference will take place in New York on September 5, with invitations bearing the Lumia and Windows Phone logos.
Following confirmation of the event, Nokia's executive vice president of sales and marketing Chris Weber took to Twitter to draw up battle lines with rival manufacturer Samsung.
He wrote: "Samsung take note, next generation Lumia coming soon."
Microsoft unveiled Windows Phone 8 back in June, where it was confirmed that the operating system will be built on the same kernal as the PC edition of Windows 8.
Nokia slashed the price of its Lumia 900 smartphone shortly after the next generation OS was revealed.
Watch an introductory video for Windows Phone 8 below: