I've seen over the last few years that these new milks are coming out i.e. Rice and Almond milks so why not Walnut milk as Walnuts are very high in the omega-3 fatty acids. So has anyone ever seen any product like this anywhere in North america or over in Europe ...

Well, I think various varieties of milks, such as rice milk, and almond milk, have been out for sometime now, probably more so in health stores. But they have been stocked at regular grocery stores and supermarkets in recent years. I don't think I've seen walnut milk yet. But rice milk, made from brown rice, is tasty. And I saw there's an oat milk out now, also, that I might try.