I think that there are some subtle changes there. We don't have any roles (mainly Artillery), but we still have some role-like keywords like War Machines:
We know that Chariots are War Machines in 4.0, and most of the upper row keywords have some gameplay utility. Some are just there for Abilities, but others have strightforward rules like Wizard 9, Fly, Ward 5+, etc.
We know that there are multiple USR tied to weapons, and just look at how many ranged weapons we have: voley guns, harpoons, drills, gas-thrower guns, multiple-barrell guns, cannons, catapults, bolt throwers, etc... that's a lot of stuff to showcase that will be drastically diferent than 3.0 weapons.
Pretty sure that some people (like me) would be really interested in a bit more knowledge about range and shooting.