The Nokia Lumia 900
,via AT&T, is already available in black and cyan. These two colors became available on April 8, with the intention of the white version coming soon afterwards.
The above photo, courtesy of Mobility Digest, shows that the white Nokia Lumia 900 is now out and available, as AT&T had said it would be, on April 22. The white Nokia Lumia 900 is still not showing on AT&T's official website yet, but you may be able to get one at the AT&T stores.
Nothing has changed for the Nokia Lumia 900 but the color and will have the same features as the black and cyan version. Here is a recap on the features: Windows Phone 7.5 Mango, 4.3 inch ClearBlack AMOLED display with 800 x 480 pixels, 1.4GHz single-core processor, 8MP Carl Zeiss camera, and 16GB of internal memory.
Price remains the same at $99.99 on contract.