Look like Cell Phone Signal got their hands on a alleged leaked T-Mobile internal document. It shows the unofficial release date that we've been hearing for a little while. It also shows both the white and black 8520s. It looks like these are the two colors that it will be launching with. It also shows an overview of the specs on the lower end Curve in the 85XX series. No word on the price yet, but this will most likely be a $99 on a 2yr contract, or close to.
PS: Look at that nice "Glide Pad"