There is currently a Warhammer 40K MMO shooter being developed and its called Warhammer 40K: Eternal Crusade.
It is gonna be a buy to play title much like the Guild Wars games, The Secret World and similar titles but will also feature a free unlimited trial where you can play as an Ork.
You can unlock features through microtransactions if you choose to play the game for free, however not everything will be unlocked, but you can still take part in all of the battles that will be taking place alongside those who chose to buy the game.
The developers themselves said in an interview that the reason for why the free to play part will be like this is to make them the terrifying green tide that they are in the games, after all they are known for their strengths in numbers and not exactly their weaponry as most of them are just hastily put together junk that are more then likely to malfunction in the middle of a battle.
But those who buy the game get access to all the races included in the game and not just the Orks, those being the Space Marines, Chaos Space Marines and the Eldar as well as the Tyranids as a non player race along with the advanced classes that each race has.
The game will center around player versus player with each faction fighting for control over a planet much like the Dawn of War Dark Crusade expansion pack or the free to play shooter Planetside 2, pilotable vehicles will be in the game too so its a bit like Battlefield in that sense and of course many of them will allow other players to jump in as passengers or gunners on one of the turrets.
It will also not feature a leveling up system since it is after all a PVP game that focuses on skill and not getting more powerful, but you will be able to customize each unit class type that you bring to the battlefield.
If you want to equip a more powerful weapon, you will need to spend points in order to equip it from your loadout which is meant to keep it more fair, its kinda like how you earn money during rounds in the old Counter Strike games and then spend them to buy new weapons and armor for that round.
I actually have bought a Founders Pack for the game and it was the 40 dollar one called Warrior Pack that will grant me early game module access along with a game key and 40 000 points that can be used in the premium shop called the Rogue Trader, these won't be pay to win things however but rather cosmetics and such.
The one thing that makes me kinda sad about the game though is the fact that the Imperial Guardsmen aren't in here as that is a faction I really enjoyed playing as in the Dark Crusade expansion pack on PC, they're quite numerous as they rely much on conscripted young men as well as really big tanks and mortar strikes.
They also share some similarities with the Soviet Union army due to the fact that the Commissars, which was also the same name for the officers of the Soviet Union, will shoot any troop that attempts to retreat, Stalin gave during WW2 an order that made it so that anyone who attempted to retreat would be labled a traitor and coward that would be shot instantly, an example is given here in the cutscene for when you attack the Imperial Guardsmen HQ in Dark Crusade:
Also the website has a referral system like a lot of games do nowadays, so here's my referral code incase anyone gets interested in registering on the website: