In May, eagle-eyed observers noticed that Walmart had added a $30, onn.-branded 4K Android TV-based streaming media device to its website, but at the time, there was no way to add it to your cart.

Google I/O is just around the corner. But for all the new Googley goodness we expect — and a ton of that’s going to include the letters A and I — one thing we’re not planning on seeing is a successor ...