There will be V5, currently we are working on it in area 51, our testing has to be done there because it's top secret and nobody can steal it again. We got the government to stop dissecting aliens and let us test virtual monster trucks there with their left over NASA computers.
I don't see why everyone is complaining about lag, it looks really low detail, very few rounded edges and most cylinders are under 12 verts each. Most of the detail work seems to be in the textures and shading... Something we seem to be missing here... It looks nice.