We shall see. Personally, I am still not done with ArmA II yet. ArmA III, apparently, went Sci-Fi quite suddenly, and since then, I haven't felt like keeping up with the series.
And to tell the truth, I always get rather suspicious when a game promises that sort of great, big features; global maps, infantry combat, aircraft combat, vehicles and whatnot. It sounds quite impressive, but it could also just be unfocused. While the vehicles in the ArmA series are amusing and at least reasonably realistic, it is clear that the focus was mainly on the infantry combat, which was the best choice, overall. It worries me with games that do not seem prepared to make that choice on focus.
Also, what does 'A Global Sandbox. Open World. No Limits.' actually mean? It is just buzzwords, and rather worrying ones, too. Is it an MMO? How does the global interface work? How detailed is the sandbox? Is there a strategy element to it? And the scenes in the trailer, were they staged, or were they part of a mission/scenario or a random event? I am assured that it is No Limits, at least.
Added to which, it looks incredibly unpolished at the moment. It looks more like a budget ArmA by way of Unity, at a glance. Besides the global map thing, it does not seem to do anything remarkably better or different.
And, of course, the most important question; does it come with an editor? I'd be surprised if it didn't, though.
It is... Intriguing, at the moment. Quite possibly a pleasant alternative to ArmA, but there isn't much to go on besides that. It looks rather unpolished and unfocused, and I'm unsure if the global map gimmick will truly hold up. It sounds and seems impressive, but I imagine it would look rather generic and undeveloped, once you are in the thick of it as an infantryman or vehicle crew, and can see the pre-baked, recently generated buildings up close.
Well-worth keeping an eye on, but I'm unconvinced. Hell, I think it could be fantastic as a focused strategy game or combat flight simulator or similar, something less likely to draw attention to the drawbacks of generating level from satellite maps.