Have been reading this forum for a while and decided to register to answer a few questions.
Space walking will also be a part of Blockade Runner but atm there is no humanoid movement system.
When I tried that a week ago or so there wasn't any mining as far as I could tell (I certainly didn't have any tools and couldn't make any)[...]
The game is in an very early stage of development. Last free update was after 12 weeks of development.
So there are many features missing. Atm you can just build and fly.
[...]and there was only the shipyard with no ability to save anything[...]
Saving works just in windowed mod. This will change in future.
[...]
which just consisted of building things from blocks and some kind of screwed up piloting of masses of blocks that didn't look like ships, if you were standing on the outside of them because you couldn't see anything from inside, and nothing else.
You have to stand on the right hight to look outside in some ships. Also the thruster system is just a rough concept. It will get much better in future. Atm you need perfectly balanced ships to fly straight.
There is a paid version IIRC, though I'm not too sure about the progress of that version. Never played it myself, but I'm sure the lack of visibility plays in part of strategically placing the bridge. I found a thread about ship designs and evidently some people have been able to arm their ships have weapons. Whether this is just lore and story without functionality I can't be arsed to verify.
Here it is! http://www.zanmgt.com/forums/blockade-runner/blockaderunner-general/show-me-your-ships/
The only systems working atm are the thrusters and helm pads (to fly the ship).
The weapons and everything else is just faked out of blocks. But this will probably change with the next update.
(Paid version is one month ahead and got a few features extra)
For more infos about updates and the game itself visit this thread:
http://www.bay12forums.com/smf/index.php?topic=83270.0Viken is giving many infos there.
Or visit the official site:
http://www.blockaderunnergame.com/Projects/BlockadeRunner.aspx