Shadow Assassin: Stealth based
Ranger: Bow, ranged based
Tactical fighter: CC, control, support based.
I don't think so, at least not on the first two, any more than dragon knight has an axe and heavy armor tree or a sorcerer has a staff and light armor tree. Bows are covered by the general bow tree, and stealth by the medium armor tree.
They will likely have control abilities in a distinct tree (the other classes certainly do), but they will probably have a weapon-agnostic dps tree (throwing knives, like the guy in the teaser video, perhaps), and some manner of utility tree (where the templar has healing, sorcerers having 'summoning,' and dragon knights have 'damage resist'). If zeni is boring it will be a second dps tree. I wouldn't be surprised at movement abilities with a few temporary stealth effects.
But the pattern does seem to be DPS tree, CC tree and class-specific utility tree.