Yes as in this has the best first person stealth I've played in a very long time. You essentially crouch inside vegetation or behind a tree and obscure the enemies line of sight. Works really well. Sound suppressed weapons also actually work. To get the extra XP (1500) by liberating checkpoints without being noticed. I go out at night with suppressed weapons and slowly take the pirates out. But at the same time, you can go in guns blazing...or flames blazing because the flamethrower is amazing. So it's either stealth or not, it depends on how you want to play it. I believe this stealth system is more like Dishonored's than DXHR, just as a reference. If you like stealth you'll like the direction they went. Same goes for people who want to destroy everything.
It's quite like Deus Ex, but in an open-world, sandbox-like setting.
I think the only time you will need stealth is when taking over outposts. What happens is that you have a bunch of enemies around an area. The area will have enough hiding spots for you to snake around. You can either use silencers, or perform takedowns, to kill enemies. Hiding bodies is a skill you must learn. You can also 'mark' enemies using your camera to help you keep track of them. There is a spot-meter that shows up only when an enemy sees you.
That's about it. It's not true stealth, since there is no option to successfully complete a mission without killing enemies.
Thanks for the replies everyone. I will go with hitman or dishonored first, and then maybe pick up this game, since this game is not quite "stealth". The game in itself looks fantastic though, going to pick it up in the near future