what new features does it add to minecraft?
You won't be carrying around all your equipment like in minecraft. Instead you'll be building mine carts and tracks from point a to point b to move your supplies around.
"Minions" will be implemented. Arcas said (and I'm paraphrasing) that you would start a game building a small base, then recruiting minions, then training them to perform day to day tasks and/or assist with whatever goals you had in mind like making your base larger, adding extra defenses to your base, or just carring stuff around for you, then by the end of the game you'll be in your superbase trying to defend yourself and your kingdom and all it's inhabitants from the 1600 angry mobs that want to get at you. (This was an idea for one mode of gameplay, there will obviously be other ones.)
There will be things called "Relics" which are basically little things you can find hidden about the map that let you do special stuff. Right now the only one I'm aware of is the jetpack. You can find a jetpack hidden somewhere and when you do, you can fly. There's going to be more and I think I saw some mention of nightvision, "Predator" cloaking, and "Predator" vision.
There is plans for a "Camera Block" which is just a camera that you can place around your base. Then you can run wire all the way from the camera to, say, a secret fortified bunker underneath your base that is filled with television screens. Basically, you can set up a security room and watch every nook and cranny of your base and its perimitter from one spot.
A ray gun was recently confirmed. From what I can tell it functions like a pickaxe mostly but it can be used to break blocks from a further distance and it does it faster too..
I'm sure there is more in the works, but that's just a few things I could think of off the top of my head.
EDIT: @ Gamgee
Go here.
http://www.fortresscraft.com/
go to the official forum and the fan forum. The creators user name is DJArcas. Read his posts. From what I understand there are a small handful of people that are hired now to do smaller things like talk to the press or put together the music, and of course to toss around ideas with, but as far as I know Arcas is still making the actual game part of the game alone.
Also, digging the sarcasm bro.