DiabloFans

*cough*

I was so excited when I saw that the DH has mechanical traps

Exactly, no guns!! but they could still have a lot of options on technically simple traps.

so.... about those traps...

I think traps similar to the assassin except with a more mechanical feel. Like ones that shoot out arrows or maybe two are thrown out with a trip wire that causes an explosion.

I think a ranged class with a tree to improve arrows, one tree for traps and possibly a tree for a single pet

It has been discussed that most if not all magic types have already been used and the barb has physical taken, so what does that leave for the last class.

We are still missing the traps concept from D2. Perhaps the last class will use not magic but mechanical traps for some damage. There is a quote from bashiok that says:

This place seems to have mechanized and magical defenses, still working, despite the place looking like it could collapse in on itself at any moment.

so mechanical traps do exist within the realm of sanctuary. I think traps would work really well with the assumed ranged/bow class.