Of course it is better to wait to be sure. But I really doubt that they work on those devices for fun. They lack time and resources so when they work on something, it is usually for production.
The three devices depend on the same platform "nile". So I guess they minimise the efforts while trying to have a multi-size offer. I expect that android support for example will be really similar or ideally the same (only dpi and screen concerns will matter afaik).