I do understand fully why you can't let people know a general area for the perspective purchased land.
In this day and age if someone finds out where you plan to put your stadium they will quickly jump in and place theirs there first. It is a nightmare, every week the local estate agent is having to fend of dozens of rogue stadium builders demanding to see the latest large site (just outside Coventry) suitable for a stadium. It is getting so fierce out there that last night a stadium builder was caught measuring up my mother in law for a pie stand.
It's good therefore in my opinion that they keep this all secret, even once built.
With each new announcement comes a new deadline, and I do understand why. I think you find that all these deadlines for announcements about locations of Stadiums made by Sisu are simply deadlines to announce the announcement, of the announcement, of the announcement, of the announcement, of the announcement, of the announcement,of the deadline to tell everyone that a stadium will be built....somewhere.