Here are some quick highlights of the interview with Team Ninjas own Yosuke Hayashi:
#1. Ninja Gaiden Sigma will be the Starting Point for the NEXT Generation of Ninja Gaiden.
#2. The classic Ninja Gaiden games most likely will not be on the PS3 version as it was on the XBOX
#3. Ninja Gaiden Sigma will contain everything the XBOX Ninja Gaiden Black offered in the way of downloads included and some of them extended.
#4. Additional Downloads over PSN are not identified yet, as a strategy with Sony has yet to be decided on.
#5. They want to include HOME options for Ninja Gaiden, but right now they have no information and tools for it from Sony.
#6. There are double Katana swords as new weapons. They are based on the combat style of Miyamoto Musashi.
#7. Sixaxis Motion Controls are supported. The developers inserted a routine, which recognizes whether the player vibrates the CONTROLLER with a hand or both hands. The Sixaxis functions in Ninja Gaiden sigma therefore activate only, if one holds and shakes it with both hands. Hayashi wants to avoid by the fact that one holds the CONTROLLER only with a hand and it flies away when vibrating and slams e.g. into the television.