Read some pretty interesting stuff from some of the dev Q and A on the SC forums...
1. EVA/ Boarding. They are going for a very 'seamless' approach to this sort of thing. So technically if you've disabled an enemy ship and you are in a solo-pilot vessel you could pull up next to the disabled ship and just EVA over there and blast yourself in the enemy ship. The dev said there would be several disadvantages to this, namely it would take a lot longer, and your pilot EVA suit isn't exactly designed for hauling weapons and explosives. He compared this to using one of the more 'dedicated' boarding ships with appropriate docking collars and hull-cutting equipment, where instead you've got 5 or 6 'marines' kitted up with assault rifles and armor, you latch on to the ship and get your crew in before the victims have time to prepare their own defenses.
They are aiming for a steep risk/reward for this sort of activity, they don't want this to be grand theft auto in space. IE if you screw up the 'victims' can just as easily steal your ship and kill you.
2. Ship systems/ subsystems. Where you shoot people matters, you can destroy engines, weapons, shields, etc. You can hit this stuff manually but if you have the appropriate sensor packages installed on your ship you can determine these things easier. Also plenty of neut/nos type of weapons are planned for destabilizing enemy power. Tons of small details like if you drain an enemy ship, they will have some battery power but if you drain it completely even the lights will turn off.
3. On the larger ships you will be able to walk around, etc, during dogfights. Think Millenium falcon running to man the turrets, etc.