So let me start off by saying that this is the same guy that leaked BF1 as early as March 2016. He was right about the majority of things that turned out to be in the game (Operations, The pigeon game mode, can't remember exactly what that mode is called, etc...)

He has Resurfaced once again to leak the newest Battlefield game. With his track record consisting on of BF1 leaks (That I know of), as always, take it with a grain of salt. Some of this might be true and some of it might make it into the final game and some of it may not.

He goes on to say the following in order:

Game Title:
Battlefield: Bad Company 3

Game Setting:
During/Post Vietnam.

Game Modes:
Conquest: Classic Battlefield style Conquest.
Rush: He doesn't touch too much on this mode. We can safely assume it'll be the exact same classic game mode we all know and love.
Operations: Mix between Conquest and Rush.
Domination: He also doesn't touch on this, but it's self explanatory.
Team Deathmatch: Again, doesn't touch on it, but it's also self explanatory.
An unknown 5v5 game mode: Similar to squad obliteration (essentially Obliteration, but 5v5. I would also assume the maps for this mode will be sized down).


Maps:
Focused more on tattered gameplay, less on all out warfare. Maps will be similar to die-hard Battlefield fan favorites such as: Grand Bazaar (BF3), Oasis (BF: BC2) and Harvest Day (BF: BC2).

Gun-play:
Vietnam and Cold War era guns.

Customization:
The player will be able to customize character, gun,vehicle models. It will be more similar to Battlefield 4.

Vehicles:
It will include tanks, LAV's and helicopters.

Kits:
Assault, Engineer, Support and Recon.

Micro-transactions:
Battlefield: Bad Company 3 will not follow in the same path that Star Wars: Battlefront II did. Dice are considering bringing back "battlepacks", but in a BF4 fashion.

General Feel of The Game:
Faster paced than Battlefield 1.
Higher skill gap.
More versatile gameplay.
More longevity.
Vehicle play will feel more like Battlefield 3.

He claims the game will be announced at E3 2018.

If you're more of a listener, then give his video a watch. It basically talks about the same things just wrapped up into one video.

My Thoughts:

I'm personally super excited and believe this will be true. At the very least, it being true that Battlefield 2018 is in fact Battlefield: Bad Company 3. Which I could't be happier! One thing that leads me to wonder is if they will have the same main characters that were in BF: Bad Company 2. The Characters in that game were fantastic! The humor was just one of the many things that made BF: BC2 great! In my opinion, I feel like the Battlefield franchise kinda lost it's spark after Battlefield 3/4. If they can pull off great map destruction, great single player and fantastic multiplayer, like Bad Company 2 had, then I can see this being a great game that I've personally been waiting and hoping for years now!