If they are counting on using simply Fingerprints then this can be easily tricked up as the users above said . they need to make something more secure like that eye recongition or whatever his name is like Nokia are planning to do on their phones soon or Finger vein pattern which is obviously the future https://www.youtube.com/watch?v=GOWD9_vj75I
but it's still a good idea and something more for security i guess , when it's going to be available btw ?