According to an FAQ published on Nokia Connects tethering is coming to Nokia Lumia devices "soon". The FAQ was primarily about the Lumia 900 but covered Nokia's other Windows Phone 7 devices. Nokia Connects say that tethering will coming to the Nokia Lumia 800 and Nokia Lumia 710 via a firmware update soon, and it will be included on the Nokia Lumia 900 and Nokia Lumia 610 from launch.
Q: When will the tethering update for the Lumia devices be pushed out? A: It will be in coming soon for 800 and 710 via Zune update, for 610 and 900 it will be available at launch.
Q: From a design standpoint, I’ve found that not using the cover can lead to scratches on the chrome element around the camera on the Lumia 800, has that been taken into account for the 900? A: It’s the same design on the 900 as on the 800.
Q: Is the camera on the Lumia 900 better than that on the Lumia 800? A: The Lumia 900 incorporates camera optimisation for focus and colour balance.
Q: Does the 900 have the same audio hardware as the 800 or has it been improved? I also find the speaker volume low on the 800, is it better on the 900 A: It’s the same speaker module on the Lumia 900 as the 800 but based on feedback from the market we have improved the audio tunings.
Q: Are the improvements to the audio tunings on the Lumia 900 to do with hardware or software?A: It’s a combination of both