Eldar Murtazin today tweeted a very interesting little tweet. According to him, Nokia R&D is currently working on 4 Windows Phone 7 devices. Two of these would be of Chassis 1, and two of Chassis 2. We still don’t know what the Chassis 2 will be, but it is rumored to be a cheaper version of the Chassis 1.

Here’s what Mr. Murtazin tweeted:

Nokia R&D – 4 Windows Phone 7 and 1 tablet (Win8 presumably). 2 phones used chassis 1, 2 based on chassis 2 – like HTC Ignate (middle end)

The HTC Ignite is something that came up a few weeks ago. It is said to come with a 800MHz CPU and a 3.7-inch resistive screen. Currently Chassis 1 requires a 1GHz CPU, and a capacitive screen.

Two Nokia devices that use Chassis 1 would be high-end, and the two Chassis 2 designs probably more in the middle-end range.