i have a hunch that the male vault hunter might be hansome jack, they looks so simalar, (i don't know how to insert images, so just look up a picture of hansome jack and the guy to compare)
Young vault hunter:http://www.junkiemonkeys.com/wp-content/uploads/2013/12/18cc10de43037b85741ad3f7adc5e268.png
Doesn´t look so simalar to me.
Pretty sure the focus will be on the two new characters we saw in the teaser trailer (though this could well be wrong).
it could be younger jack just a theroy is all i'm saying
This is pretty late, but it's impossible to be a Young Handsome Jack. The girl and guy in the trailer are clearly the main characters. But on top of that, when Marcus tells them they don't want to go along with it, Handsome Jack in his current age (Before he gets killed) talks directly to us and says they do. It wouldn't make sense to use old Jack as a clear antagonist, then have a younger Jack as a protagonist at the same time.