You can't have a new phone these days without having a flip case for it. It's the law. (Or something.) And ASUS has a brand-new one for its brand-new Zenfone 2. It's of the circle variety, so you'll get a clock face when the cover is closed. Open the cover and you're right there in the phone UI, as you'd expect for this sort of thing.
You get more than just the clock, of course. The flip case also gives you quick access to the calendar and flashlight, will show whether the phone is charging — and you can even take a picture without having to open it.
The flip case will be available at the same time as the phone — which is to say, basically starting now — and it'll run $39.99.