Presumably we've been offered c1500-2000 tickets & are in negotiations for another c1000.
Obviously I'm just making up the numbers, but presume the Dutch FA are holding off, to see if they can sell enough home tickets to warrant them allocating the additional section to home fans or if not, then we'll get another 1k tickets.
As I said, don't read anything into the numbers I've used, just plucked them out of thin air, no inside knowledge.