I don't know of anyone with the new 4.7L that has, but I can say that superchips is honest, I've seen their dynos compared to customers actual dynos on other vehicles and they are about spot on. I plan to dyno mine in about a year or two once I have all the bolt on stuff I want installed. I'm hoping to get as close to 300rwhp as possible, which might be a hair optimistic, but should be close.
If you find one elsewhere, please post it. I'm pretty sure I've seen a few dakota 4.7L guys post theirs on other sites (same engine) and they were hovering around 250hp at the wheels or so.