Like the title says, MS is entering the mobile gaming arena, but the interesting part is how.
Unlike the Xbox, MS is going back to their roots and allowing/encouraging others to make the hardware while they provide the software.
I mentioned in the PSP2 thread that a company is showing a dual screen gaming device, and that is the Razer Switchblade. It has two 7" screens, with the lower screen having raised keys on it that can be changed according to game. Engadget has an in depth preview and they are convinced that Razer has the intention of bringing this device to market. They weren't allowed to get video but they report loading up WoW and being able to remove icons and mapping them to the keyboard with the icons themselves rather than hotkeys. There is also a function key that switches the keyboard to "page2" which does mean a second page of keys/icons/controls or whatever you need. Engadget also notes that the device feels good, if a tad thick, can fit easily in a cargo pant pocket, and the keyboard is just as good for typing as it is for gaming; very good.
There are also two other devices from Ocosmos; the OCS1U and OCS1E. The former is a 5" touchscreem device with dual joystick pads on either side of the landscape device, and the latter is the same device without the joysticks. I think there was even another from another company, but there's so much coming out of CES it's hard to find things.
All these devices run Windows 7 (not Windows Phone 7) and have the primary function of gaming, so there won't be a Halo 3DS. It will be interesting to see the level of games these devices can play, and if MS imposes some minimum restrictions or if it's like the PC gaming world where the device simply needs to run the OS.
I sort of figured this would happen and made mention of it in either the 3DS or PSP2 threads, or both, but I thought they would do it through gaming phones like the PSPhone, which they could still do.
The Ocosmos devices are gaming tablets, like Sony has made mention of doing with their PS line.