Picture of the A77 has been used by Mobile01 to show you where the A99 pixels are.
The taiwan site Mobile01 (Translation here) explained how the 102 AF point system of the A99 works. As you know the A99 has a Dual Phase Detection system. There us a 39 point AF sensor that uses the reflected light from the Translucent mirror. And there is a 9×7 pixel phase detection system on the sensor itself. It’s the same 9×7 system used on the Sony NEX-5R. That makes a total of 102 AF points and eleven of them are cross point.
P.S.: Full Sony NEX-5R preorder links at AlphaCameraDeals.