Actually no, there will be a public demo later. Tech demo is a kind of bonus for those who supported Kunos in the past bought NkP. It's also a way to decrease number of people who will download that tech demo. AC is greatly anticipated and having plenty of people download tech demo and report the same bugs would be inconvenient for Kunos. But of course if someone wants to get hist hands on AC tech demo, he can buy NkP even now. It's everyone's personal choice - depending on how badly someone wants to get that tech demo. I will probably wait.