what is so special about it?I've read something, but I can't quite understand.
Nothing, yet. What could be special is dependent on how well the final product lives up to the developers ambitions, and while it's looking good it's still too early to really determine if that will happen.
So, the basics. It's a space sim. Not much to explain there, think Freelancer (look it up if you need to). You fly your ship around, take on missions, buy stuff, sell stuff, upgrade your ship, whatever you want really.
That much is fairly common, a genre of game that I enjoy but nothing standing out much.
Next, less common level is the fleet based stuff. You're not just limited to upgrading your one ship, you can buy more, hire others, own/build stations, build up a fleet play out great battles like an RTS if you desired.
Great features, but here we're on par with the X series, so nothing new (although hopefully a bit more friendly on the UI side)
Now we come to Limit Theory's main advertising point, the 'limit' part. Ideally, there are none. The Universe is infinite and will expand as you explore, allowing limitless gameplay.
In words, that part sounds great. Realistically, Playing with 1,000 systems rather than a million likely wouldn't hurt the experience so this probably isn't going to be a huge deal. But in addition to that, everything else is generated on the fly as well. Weapons, ships, some technologies, NPC's/factions, everything. So every game you play can be an entirely different universe.
That stuff is great, but all things said, arguably not significantly more impressive than a well coded and well designed variations of game series that already exist.
Now, all preceding things aside, what will make LT special? Hopefully, it's the AI. This is the one still uncertain feature that will determine if the game is good or amazing. If the dev lives up to his own dreams, then the selling point of this game is in smart, believable AI leading to a Universe that feels alive.
If the AI meets that goal, we'll have not simply a great, expansive space game similar to numerous others, but a true space sim, one where we can live in a universe that actually feels like it exists without us, as well as feel like our actions impact the course of the universe (because they do).
On the other hand, if the AI doesn't meet that goal, LT will not be all that special. I'll still play it, but basically it'll just boil down to 'yet another' space game, hopefully more stable and with smoother performance thanks to a quality code than many other games, but nothing super amazing.
Time will tell, hopes are still high.