In essence, trading is the core of the Elite franchise. The original's premise was that you were a trader making your way in some sort of a "wild west" space atmosphere (yes, I get the oxymoron) where you needed to be a decent gunslinger to survive the occasional attack.
This will be the first installment of Elite that really allows the freedom for a player to be something else - like a pirate or bounty hunter (or miner or explorer).
My hope is that they expand trading greatly, from simply moving goods from one location to another, to really engaging in the development of the world(s). After a while, that will provide a much greater incentive to trade and move goods than just making profit. (It would be much more interesting to foster the growth of a colony or the development of an anarchy mining colony into a truly developed system.)
That said, in Elite, you have to be a bit of a Jack of all trades. Maybe you won't want to be a full time gunslinger - but you're sure going to have to know how to handle a gun just to survive the occasional attack.
Also, as a trader you will be a bit of a target for many of the more armed players out there. There's nothing wrong with that as long as you accept the role and realize that, just like in a game of tag, you're probably eventually going to get caught...