Official: Asus, Dell, Lenovo and Samsung Ready Windows RT Tablets
Gizmodo

Microsoft has confirmed that device-makers Asus, Dell, Lenovo and Samsung are releasing tablets that run on Windows RT (the ARM-based version of Windows 8). Microsoft itself is releasing its own branded tablet, the Microsoft Surface. Officially announced so far are Asus Tablet 600 (RT), Microsoft Surface RT, and the ThinkPad Tablet 2 (Windows 8). Microsoft said "thin and light" Windows RT devices will have "all day battery life".

What Else You Need To Know:

- More OEMs will be unveiling new products as Windows 8 and Windows RT launch scheduled for Oct. 26 approaches.

- Microsoft said it has seen 8 hours to 13 hours of HD video playback time on Windows RT PCXs, and 320 hours to 409 hours (more than 13 to 17 days) battery life when in connected-standby mode.

- Microsoft reportedly did not tie up with Nokia for the Surface tablet due to "branding".

Other sources

Good E-Reader
Lenovo IdeaPad Yoga Will Run Windows RT  

Lenovo already has planned the IdeaTab Tablet 2 which will run Windows 8 Pro and will be targeting both the business and home users. Lenovo has also a second version of the Yoga i the pipeline, one that will have a battery life twice that of the Intel version.

Gizmodo
Here's Who Your Windows RT Tablets Will Come From  

Microsoft didn't add any other details as to what these gadget will actually look like, when we'll see them, or how they'll be priced.

ZDNet
Microsoft passing on Nokia for Surface tablets -- it's a branding thing  

Some are wondering why the company didn't rely on its hardware partner, Nokia, to build the Surface together. Simple, it's a branding thing.

Other
Microsoft Confirms Windows RT OEM Partners, Details Collaboration
Mashable
Microsoft: Windows RT Tablets Will Last for Weeks in Standby Mode
ZDNet
Microsoft: Dell, Lenovo and Samsung Windows RT machines are coming  

Microsoft and partners built "thousands of reference design hardware systems" and seeded more than 1,500 Windows RT reference machines to software and hardware vendor partners to prepare for launch.

Good E-Reader
Asus, Dell, Lenovo, Samsung To Launch Windows RT Devices