Chaplain's, Apothecary's, Terminators, and Dreadnought's oh MY

I know new classes are planned for the future but my personal hopes/Ideas(Both realistic and Unrealistic) for possible future content are:

1. A Chaplain class that's all about Melee and Support, with an ability that that could possibly do something like the Chaplain abilities from Spacehulk Deathwing, or something like Temp immunity to dmg for a short duration(Slightly less than the Sniper's camo cloak) which also taunts the enemies and forces the AI to target you instead of your team mates(Which would mean you are surrounded by enemies once the ability wears off).

2. An Apothecary class that's all about Support and keeping your squad alive, with an ability that allows them to flat out heal team mates or give them temporary health regen while active.

3. A Terminator Class that's all about being a heckin WALL and absolutely mowing down large hordes of enemies, with an ability that lets them boost the dmg and RPM of something like an Assault Canon, they'd also likely be unable to sprint due or Dodge to the weight of Terminator Armour which means that despite the immense damage and HP or Armour pool they'd be incredibly slow and lack the maneuverability of the other classes.

4. A heckin Dreadnought Class that's literally all about being a damn Juggernaut, now this class would be specifically for things like a "Dreadnought mode" or the Horde mode that's planned for S4, as for the ability I'm unsure of what you could give a Dreadnought or if you should even GIVE a Dreadnought class an ability considering just how much fire-power they wield which is also why this is my pick for something that'd be seriously awesome but also completely Unrealistic and will most likely never happen.

Small addition: The customisation for a Dreadnought class would be seriously intensive on how long it would take to design good looking cosmetics and, despite the game already having the Redemptor Dreadnought in both the campaign and an operation, would probably also take a fairly long time to actually get to work right in a player's hand's which is why it's my unrealistic pick for a class. As such while I don't expect anything to ever come of it I do sincerely hope we eventually get to wield these monuments to humanity's need for slaughter and unyielding fire-power against the Tyranids, Chaos, and whatever other enemies the dev's decide to add.

Note: i will be making more in depth post's about what specifically I'd like to see for these classes. The first of which, the Chaplain, is already posted.