Based on the speculation that with increased budget we "may" get three classes... Samurai could possibly be a tank. My personal opinion is that's a bad move towards players that like two-handed dps jobs. If Samurai is a tank then we have 4 two-handed classes in the game, 3 of which are tanks. So you pretty much have to play Dragoon to enjoy a 2-handed playstyle.

Just my 2 cents on the speculation train