I think we should get to know how exactly the different classes for the SM faction will look like before making demands about what equipment they will have. If I had to guess, I would imagine the class system to be somewhat like this: Dedicated Melee: Assault Marines Dedicated Range: Devastators Support: Tac Marines (Possibly a Heavy Melee class a la terminator?)
The chaos chosen is a confirmed class as tactical upgrade (low range damage but way better melee damage) he's equipped with chainsword and bolt pistol on the picture, thus I'd say tactical loyalist marine could have an upgrade as sergent the same, or as veteran to not make issue with the hierarchy system.
I think they're trying to focus Chaos with a lot of melee combat bonuses so you'll see an upgrade similar to that but I don't think (And hope) it won't be melee. It might allow you to take something else though.
I think they certainly propose us several upgrades since it will be a horizontal progression, thus as a tactical you could have more choice : - more melee capability, as a sergent - more polyvalent as a vet - more range with plasma gun unlock maybe.
I feel like the classes are going to be much more lenient in this game than in Space Marine. Im more curious about how equipment is going to be acquired.
I don't think they're going to be very lenient on it, there will be different loadouts per class as far as we know.
I'd really like them to keep the RPG in MMORPG Im not saying give Raptors Plasma cannons or anything, but make it more diverse than Space Marine.
You might see high rarity unlocks that allow you to have these kind of cross class equips. I certainly wouldn't mind it I suppose!