In the past few months, Nokia has been making a number of moves intended to return itself to its former position of near-dominance in the smartphone market. Most significant of these have been its announcement of new devices powered by the Windows Phone mobile operating system, as a replacement for the outdated Symbian OS.

According to SlashGear, this trend is continuing today with the release of a new, official promotional video from the company. Although the exact subject of the video is not clear, it appears to depict a new, unannounced smartphone, which some are speculating is the rumored Nokia Ace, or N900 model.

The news source reports that little about the design can be gleaned from the video. Images of the screen indicate that the device runs on Windows Phone 7.5 Mango, as do Nokia's recently announced Lumia 800 and Lumia 710. Additionally, the screen appears to be about 4 inches long, larger than other high-end Nokia devices.

Meanwhile, Time Magazine reports that the Lumia 800, the high-end model of Nokia's two newest smartphones, holds up well against other Windows Phone devices. It will not debut in the U.S. until early 2012, but Time believes it may help the company move back toward the forefront of the smartphone and smartphone accessories market.