Nokia will unveil its newest Windows Phone handsets Wednesday, with Motorola later in the day unveiling its latest Google Android smartphone. Amazon is expected to announce one or more tablets by week's end. And Apple is expected to unveil .

Nokia is expected to announce at least two new smartphone models, among the very first to make use of Microsoft next big mobile OS upgrade, . The Internet rumor mills expect two new  Lumia phones.

The Lumia 920 is expected to have a 1.5GHz dual-core processor, a 4.5-inch display and resolution of 1280 by 720 pixels, and an 8-megapixel camera, perhaps based on its high-res PureView camera technology unveiled earlier this year but only on a Symbian OS phone. The Lumia 820 is expected to have a 4.3-inch screen, but the same resolution.

The announcements will be important for both Microsoft and Nokia, which is staking its smartphone future on Windows Phone. "It is very important to see a wider choice of smartphones based on Windows Phone at a lower price point," says Francisco Jeronimo, research manager at IDC. "Nokia has started growing the portfolio and lowering the price with the Lumia 610 and 710, but much more is needed. Android only started to grow when a wider choice became available."