Most of the additional content in the Conduit 2 Limited Edition are the sort of things you’d expect from a free limited edition upgrade. You get a suit of shiny gold destroyer armour, a’la Crackdown 2. You also get an enhanced All-Seeing Eye search device called the Eye of Ra.
The item of real additional value is the 44-page Conduit 2: the Art of the Game book, which is the sort of thing you’d generally see as a preorder bonus.
So you get more, but not a lot more. Still, free is free. I like free.
Conduit 2 will be out in February of next year.