After reading this message thread I looked at my exchanged Evo V and immediately noticed the Sprint logo was missing from the front at top right which the defective one had (see my 3D focus problem message).
Now I've removed the serial number sticker from the back and... voila! There's a Virgin Mobile emblem molded onto the case, it's not just a decal.
I was a little curious about all this myself after looking around the 'net for info about this phone and noticing the question elsewhere. Go to admit, I was wondering why BBM store would still have the Sprint ones after it went on sale 2 months ago. Bought the original (and defective) one August 1st. Exchanged for current one today.
Oh, and both are the black with red around main cameras not the plum color. Funny that I didn't notice the Sprint logo being gone until now, guess I had been ignoring it real good.
Of course, I have no idea about the internals of these things. Smartphone is very new to me, having gotten by okay using a Motorola RIZR Z3 the past several years without using the GPS or web browser on it and only as a camera phone!