It would appear that Sprint is getting a white HTC Evo 4G LTE phone, if a picture on the site is to be believed. While it could just be a marketer's wishful thinking, Sprint does have somewhat of a history in carrying white Evo phones. It's fairly unlikely that a marketer would change the color of the HTC for this image.
After all, the image is trying to tempt people away from other networks, so why would they show something they don't offer? Sprint hasn't confirmed that the new color does exist, but going from the marketing image, it's a fair bet to say it does. The picture, while it lasts, is available here on Sprint's website.
We will keep you updated with any information regarding this possibly new phone color coming to Sprint. I wonder if HTC's Ice Cream Sandwich phone really does come in a vanilla ice cream color?