well the concept art thing doesn't move me- it gives me the impression that someone is spending more time on packaging than on the actual game; seriously, you would rather see screenshots and a digest of features rather than more art. we get it, we've seen the art, now get to the point of what this is about.
as far as i know the titan vanguard engine that the screenshots are based on is a game engine theoretically available to the public- you have to petition the company which designed it for a free consumer version of it.
let us assume that is what this is all based on the titan vanguard game engine. in itself that doesn't mean there are high fidelity models available that come with it, things like the avionics and heads up displays and sensors of modern war machines don't come with the engine, those things would likely to be supplied by the end user with perhaps more refined physics, which i surmise because i have watched videos of the engine in action- strykers climbing very steep, nearly vertical rocky slopes, and tanks bouncing and floating in air and turning unrealistically, my sense is that the engine itself is a basis to create games with, but would still require the necessary tools and libraries by end users or otherwise a simulation will look quite amateurish once you get past the graphics and see how actors in the engine have funky behaviors (on a positive note, the shadows the engine is capable of rendering look good- rendering shadows off in the distance cast by buildings by large cities and trees is well done).
but- if microsprose is essentially a one man show at this point, it would seem to be rather difficult that a comprehensive simulation is coming together in that way, given what we know that modern computer games are resource intensive and not easy to make, months if not years are required for high quality titles with large development teams from the major developers- not anyone could just program a game from scratch, especially one which claims to compete in the simulation market- there seems to be no game testers at least as far as anyone knows, no public announcements for jobs at microprose- artists, programmers, QA managers, software engineers, play testers, none of that, unless it was all put together in complete secrecy, which seems illogical if unnecessary to do that.
maybe there is an announcement, and maybe that's what the announcement will be- an open call for people to join microprose to develop a game. on the other hand if there was suddenly an announcement of a new game in the works, theoretically the game could look good but play like crap because the actual gameplay itself is of low quality or the simulation elements are low fidelity, and so on. it takes a lot more work than just showing off a good looking game engine (however, some of the in game elements i've seen in promotional videos like civilian cars and buildings are of nowhere near the same graphics quality of the terrain) to create the rest of the world of how the actors are supposed to behave in the world