Sorry for the necro bump, but I found this thread while doing my occasional "scour google for any updates on coconut yoo hoo". I had done a short article back in 98 asking for this (bear in mind, this was on a members.aol.com page, it wasn't exactly a New York Times op ed piece).
And ever since then, have tried finding the mythical Koko Blanco, to no avail.
But for those desperate for a fix, I found that Torani coconut syrup in skim milk is a pretty darn close approximation. As close as we're likely to get, anyway. Since it's milk and not water with milk products, it won't be exactly the same texture. But that's why skim works best, since its the most watery.