Could somebody explain me the gameplay of coh? I get that is an RTS but is a bit different of what I had ever played
The beta seems fun, sadly, no offline play, but well, Maybe I will give it a chance
Company of Heroes is a Base Building, Point Capturing, cover-based, no-hero-unit kind of RTS.
I mean that there's no single unit that is not replaceable on the battlefield: You can always rebuild whatever unit you lose, as long as you have resources to do so.
There's a base building component to it, because which buildings you have defines which units you can pump out of them. The short version of it is that you need a "Weapons Support Center" to build... mounted weapons to help your Infantry units that come out of the "Barracks" building, you need a "Heavy Tank Factory" to build Heavy Tanks, so on and so forth.
The "unique" part of CoH is that you get resources not by mining anything, you get resources by controlling points. There's three (four, really) different types of points. The resource points: Fuel Resource Points (that give you fuel as long as you're in control of them), Ammo Resource Points (ditto, but for Ammo), Blank Resource Points (that in Company of Heroes 1 only gave you +2 manpower per cycle. Now, on CoH2, you can use manpower and build other resource gathering upgrades in them - Ammo or Fuel) and, finally, for "Ticket-based" games, the Control Point.
The more usual way CoH works is on Control Point games, where the amount of control points you have MORE than your enemy dictates how much "tickets" they lose every cycle.
For instance: There's 3 control points on the map. If you have all three, you enemy will lose 3 points every cycle. If you have two and the third is uncontested, the enemy will lose 2 points every cycle. If the enemy captures that uncontested point, and you still have the other 2, he'll lose 1 point every cycle, as 2 (yours) - 1 (his) = 1 (difference). In CoH1 you could play on Annihilation mode, where the end game was to kill the entire enemy army. I never liked Annihilation mode (as people would just fence themselves off and go Artillery).
The other thing associated to Company of Heroes is the cover system: Anything on the environment is a cover point (and it's indicated by the dots around any area on the map when you mouse over it with a squad selected). There's three levels of cover: High Cover (Green dots), Medium Cover (yellow dots) and.. not cover (red dots). High and Medium cover provide you with Damage Modifiers that lowers the amount of damage you take when being shot at in these covers. "Not Cover" (roads, for instance) actually increase the amount of damage you receive when being attacked.
CoH2 adds in the "Blizzard" weather, which makes your soldiers freeze to death if they're not near a heat source (fireplaces that already exist on the map and can be built by your engineers) or inside houses.
Oh yeah, you can garrison buildings as well.
Depending on the army, there's the concept of single unit promotion (your squad will get better with more units they kill). There's also the concept of "building upgrade to make all your soldiers better", both in ranking and in extra abilities.
For instance, in regular CoH, for your American Rifleman to have granades, you have to upgrade the Barracks (using ammunition) to have grenades available to all "Rifleman" squad. That particular squad will level up as they kill enemies, getting better accuracy, better defense rating, so on and so forth.
On the German side, each individual unit doesn't level up by themselves, you need to create a special building and level up that building. Each time you level up a building, all units of the option selected will go to Veteran (there's 3 levels) and get the bonuses described earlier. However, there's still unique abilities that require upgrades, either on a unit-by-unit basis (Flamethrowers for engineers, for instance, need to be upgraded on a unit by unit basis) or a "all-units-get-this" model (Grenades for Rifleman, as explained earlier).
That's a quick pass on all of CoH's mechanics. There's much depth in the game - I didn't even tell you about the Commander Trees and the special abilities they provide, which also unlock throughout the round, like strafing runs or unique units not buildable anywhere else - but i'm not nowhere near good enough to explain everything to you.
Just a side note, there's no actual single player campaign on CoH2 beta, but you can create Skirmish battles of whatever size you want, up to 4x4 with a varied mix of human players and AI players.