Nothing at all has been announced so that means it WON'T be coming out soon.

Blizzard won't keep the game in the dark and then just pop it on the shelves, no1 that has experienced diablo will want to buy simply because they have never heard of it, seen any screenshots or previews so they will obviously first announce it then realease it in about a years time or something around that and keep us updated.

Yup the painting in the basement type thing behing all the boxes and also tha paint on the floor but that still seems to not be enough