I really like the sound of a class that can set the battleground up and control movement.
Wow, someone that understands what combat engineering is. Awesome.
Thieves can -kinda- sculpt the battlefield with traps and lockpick to a certain degree, but the idea of a class that really tackles the 3 basic aspects of combat engineering - mobility, counter-mobility, and survivability - sounds incredible to me and I've love to play something like that.