It is possible that any delays might be down to AMD asking the manufacturers to wait until they have the drivers available, seeing as AMD promised the world they would have drivers out as soon as the monitors were available.
AMD will take quite a bit of stick if they mess this up, so I'm sire they want to get it right.
Good news the Driver are Ready They been out there for sometime now.. How could AMD showcase Freesync on shop floor without the Drivers.