The two Ds mean Disk Drive.Then again it was supposed to be released for the N64DD though I don't know what the two Ds mean I doubt it means Wii.
The picture they presented just didn't have a subtitle because it's most likely too early to throw out names yet. They just put in the standard logo as a placeholder. I imagine it will have a full Zelda-esuq title by the time it's released.LoZ. Remake of the classic NES LoZ. Hey, its possible.