Recently, Sony hosted a message board based Q&A session with Yosake Hayashi, the director of Ninja Gaiden: Sigma, where he fielded questions from various readers about the upcoming action title. It's a great read and covers a wide variety of topics from the number of difficulty levels (five) to their support of Home (no -- but look for unique Home support in future products).
The most interesting question though, had to do with downloadable content. When a reader brought up the Hurricane Packs for the original Xbox version, Hayashi responded with, "We'll be making an announcement regarding our plans for downloadable content soon. The content will have some amazing depth for a download!"
No additional information was given but considering their track record with DLC, we should be able to expect something pretty cool from them later this year. Further on in the Q&A session, he also hinted that we may be hearing about the next Team NINJA title sooner than we expected, by saying that "There could be an announcement coming in the very near future ..." but that until then we should enjoy Ninja Gaiden Sigma. Perhaps an E3 announcement about a second Team NINJA PS3 title? We'll find out soon!