Now that WatchOS 2.0 is released we have more than just frame animations in the SDK. It now has animation support for moving things around on-screen. It's not terribly powerful because it is based on their layout engine. The layout engine organizes content by Group, Image and Alignment. If it were D&D alignment it would be Lawful Neutral, which doesn't sound fun, but it's not even that much fun; it's alignment to a parent element (left, right, top, bottom). Many properties are animatable, though, including alignment, width/height, background color/image, color and tint color.