A bow and duel wielding daggers. Man i hope they have some awesome backstab animations.
Dual-wielding daggers here as well.
I'm not sure how effective they will be, but I plan to test dual daggers with all focus on stealth and offense, and no defense at all. I will sneak and backstab enemies (+using a bow when I can't reach some enemies) until I'm detected or if the enemy can't be sneaked upon, and then I will just run in with no defense and unleash a fury of dagger-slashes and hope that they run out of blood before I do!
If this playstyle becomes to hard, I'll probably focus more on defense when detected and more ways to stay concealed.