XBOX will have smartglass, and PS4 will have Vita integration, but it won't be "quite" the same. The Wii U GPU was specifically designed to render to both screens at the same time, with completely different images if necessary, I'm not sure if the others would be able to do it quite as well and beyond that I don't know how well wifi would hold up if you're streaming back and forth wireless video and input commands over the LAN. Smartglass and Vita depend on Wifi, Vita doesn't have video over bluetooth that anyone knows of, and Smartglass is meant to work with any windows 8 device.
Smart Glass works with iOS and I believe Android devices too. I have the Smart Glass app on my iPhone and iPad and have tried it with my Xbox 360.