Google is expected unveil its much-rumored Nexus One Android-based mobile phone at a Jan. 7 press event, coinciding with the first day of the Consumer Electronics Show in Las Vegas.

Google would only confirm that the announcement will be related to Android - its mobile-phone operating system. However a blog following mobile operator T-Mobile, says Google will sell the phone directly to users and T-Mobile will support the device on its network. Longtime Android phone developer HTC will manufacturer the device.

Pre-launch rumors point to Google's desire to sell the Nexus One without any carrier subsidy, meaning users can buy the phone and then choose which network they wish to use it on. As such, it's expected to be quite expensive, in the range of $500 or more according to early estimations.

Meanwhile, TechCrunch reports that the European streaming music service Spotify may be an element of the launch. The blog reports that Google and Spotify are talking about including the service in version 2.1 of the Android technology, first available on the Nexus One, with Google possibly paying the music licensing fees. Until Spotify launches in the U.S., though, the feature will be limited to European users.

However its achieved, a strong music integration into both the Nexus One phone and all other Android-based devices is a key factor in the technology competing with the iPhone. Android phones have access to the Android Market, an app-store similar to that available on the iPhone that lets users buy and download a range of services. Spotify has an app already available to European users, and Amazon has a mobile version of its MP3 store available as well, along with several music-focused apps such as Pandora, Slacker, iheartradio, Shazam and so on.