So where're the plans for the new Dio droid (D-O?)?

[Dyne]

I already hate him. the designs get less and less practical and more and more like robopets.

Based on the concept sketches, I'd say there's a very good chance that that's more or less his role. The concept art image explicitly includes a sketch of a duckling, and all but four of the designs look like that or some other variation on the theme of little robot animals (the second one on row two even reminds me strongly of K-9).

I can definitely see why you might feel that way. He's not my favorite design (in particular, his head reminds me a bit much of Spy vs. Spy, or maybe Alec Baldwin's monstrous face from Beetlejuice). But on the whole, I don't really mind him too much. I think a lot will depend on the personality they give the character.