Looking at development timelines, I'm also betting this is Team Kunai's game. They haven't released anything since Ninja Gaiden II almost 2 years ago, so it lines up perfectly.... for those wondering, here's what Team Ninja's 3 groups have developed before...
Team Kunai
- Dead or Alive 3 (Xbox) 2001
- Ninja Gaiden (Xbox) 2004
- Ninja Gaiden Black (Xbox) 2005
- Dead or Alive 4 (Xbox 360) 2005
- Ninja Gaiden II (Xbox 360) 2008
- Metroid: Other M (Wii) 2010 ???
Team Kunoichi
- Dead or Alive Xtreme Beach Volleyball (Xbox) 2003
- Dead or Alive Ultimate (Xbox) 2004
- Dead or Alive Xtreme 2 (Xbox 360) 2006
- Ninja Gaiden: Dragon Sword (Nintendo DS) 2008
- Dead or Alive Paradise (PSP) 2010
Team Sigma
- Ninja Gaiden Sigma (PlayStation 3) 2007
- Ninja Gaiden Sigma 2 (PlayStation 3) 2009