answer to own question
from DirecTV's own news release. Just found it, thought all would be interested.
The Boeing-built Spaceway 1 and 2 satellites will have the capacity for more than 500 local HD channels, bringing local HD programming to most of the U.S. population, and will enable DIRECTV to continue to expand standard-definition local offerings and other enhancements. DIRECTV 10 and 11 will have the capacity for more than 1,000 additional local HD channels and more than 150 national HD channels and other new programming offerings. All four satellites will use spot-beam technology to deliver local channels.