First of all the trailer:
http://tinycartridge.com/post/4805881614/mega-man-legends-3-prototype-version-trailer-shown
Second you can get a "Prologue" of the game for 200 yens in the 3DSware. (that's .... pretty much Alpha stage at this moment) and new character
http://www.neogaf.com/forum/showthread.php?t=428050