NINJA GAIDEN 3: Razor's Edge for Wii U will have free, exclusive playable characters! The first one is Momiji, Dragon Shrine Maiden. She will be available in Challenge Mode and Ninja Trials mode in early December. Source: uh, facebook lol
And the other one is probably Rachel. I heard bad things about the original version but the reason I never gave it a try is because I knew this was getting the updated release.
Exactly my reason for waiting... especially since first release was so poorly received. Also Team Ninja has history of improving their game with subsequent releases. Just never this significantly before (but considering how poor the original NG 3 was...)