I don't know whether a Community Manager can give us this information here, but i will ask anyway.
Will have Samurai a gap closer move? like Shoulder Tackle (Monk) or Shukuchi (Ninja) or Spineshatter Dive (Dragoon).
We can speculate, but i would like something a bit more "official".
EDIT; It looks like SAM will have a Dash/Charge/Fast Move:
http://i.imgur.com/ZURGKGI.png