Ninja Gaiden DS and 360 "similarities"

Speaking to CVG, Team Ninja head honcho, Tomonobu Itagaki, revealed a teeny tiny little tidbit about the upcoming Ninja Gaiden 2. Those of you who venture outside the safe and comforting walls of X3F may have heard that Ninja Gaiden is making its way to the Nintendo DS. Cleverly titled Ninja Gaiden: Dragon Sword (get it? Dragon Sword?), the game utilizes the stylus to pull off all of Ryu's sick ninja moves. When asked about possible similarities between Dragon Sword and Ninja Gaiden 2, Itagaki responded, "Well... I am personally overseeing the development of everything from the story through to the gameplay elements for both games, so if you're observant you may be able to extrapolate some similarities between the two, yes, and not just in the area of story."

We're assuming that Ninja Gaiden 2 won't magically turn any HDTV into a touch screen, so it's likely that the two games will share some other gameplay related features. We have no idea what those would be, and Ninja Gaiden: DS doesn't arrive until the end of this year, so we'll have quite a while to guess.

Any ideas?