According to Bloomberg, we'll be seeing some devices introduced at Nokia World that will run on Microsoft's recently-announced Windows Phone 8 platform.
If this is true, then we might see the announcement of new WP8 devices before the rumored press conference for the next iPhone on September 12. This may not be a good thing, however, as Nokia run the risk being overshadowed by Apple's highly anticipated announcement.
As for when we'll actually see the first WP8-powered devices on the market, Microsoft have remained tight-lipped (although there are rumors of a an October release date, to coincide with their scheduled release of the Windows 8 OS). Hopefully, if announcements for Windows Phone 8 devices are made during the Nokia World conference, we'll also learn when we can get our hands on one.