Not sure about the soy lecithin, although I would tend to agree that it is probably in a small enough amount as to be fairly negligible overall. If you are looking for something without soy, this is the protein powder I use on occasion:
Amazon.com: GRASS-FED WHEY PROTEIN CHOCO: Health & Personal Care
Ingredients are: Whey protein concentrate (from grass-fed cows), cocoa, natural flavors, stevia leaf extract, sunflower lecithin.
120 cal, 4g carb, 21g protein per serving. And it tastes really good. Most protein powders turn me off because the chemically sweet taste, but this tastes just like a nice dose of chocolate. Excellent when blended with a frozen banana and some cream.