Leopard: Where are Top Secret Features?

When Steve jobs unveiled Leopard in August 2006; he was demonstrating time machine, piles, new finder, etc... But he was ending his presentation by mentioning top secrets features which should be unveiled later on.
Fourteen months later, and couple of days before the official launch of Leopard, those top secrets features remain unknown. In addition, nothing new has been unveiled from the different beta versions of Leopard distributed to developers. So, are there any secret features? Do they really exist?
One can imagine that their development would have required additional time and resources, and with the iPod Touch and the iPhone, Apple could not devote more to the Leopard task force, making at the end the decision to drop such secret features for timing reason. On the other side, they might have never existed and simply be mentioned for creating some pressure on Windows Vista which was released later on in 2006.