Future plans would, by definition, be unreleased product, so that does not count.
And it doesn't really matter what they 'consider' public domain. A car manufacturer may very well 'consider' his design to be a secret, but once the car is available for sale they can't successfully claim it IS a secret - it is right out there in public view. There may well be things that ARE secret, like how the design was done, what tools were used, etc, but those can not be determined by examining a care (well, if they can be determined then they aren't secret). If there are elements of the design that they wish to protect, then patents are used.
Someone below used the example of Coca-Cola. Coke keeps it's formula secret. But if someone figures out the formula (without doing something illegal like breaking in to the vault) they can't claim the 'trade secret' was stolen.
The only way an NDA makes sense in this case is if they planned to have every person who entered one of 'their' datacenters, for all eternity, sign an NDA. Doesn't make sense.