If the first suggestion is true, then the "no comment" is to surprise us upon the actual release.
If the second is true, then the "no comment" is so that if it is feasible, only then will they do it. The "no comment" gives them a way out.
The last suggestion is the least likely, but not altogether worth ruling out. The reason why I say is it's unlikely is because they would've been plain and honest if they weren't including it. No reason for the "no comment". "No comment" only gives some hope. The above thoughts are only mine and not to be understood as those of Reverie's.