1. Resolution is 1920x1080. My system is pretty old (First gen i7, GTX 660ti, and 12 G Ram, Win 7 64) and, with a few tricks, it's more than playable. Never checked the FPS but it's never been a problem (although, obviously, it's not as butter-smooth as with GTX 780s and up). You still get a screen-door effect but quickly forget about it once in the game. Immersion is astounding.
2. Errr...no. You pretty much have to use a Hotas. I use a Hotas and VoiceAttack and never have to touch my keyboard. Actually, that combo (DK2, Hotas, and VoiceAttack) is about as close as a Human being can get to flying a spaceship in 2014). It's possible to drink tea with the DK2 but you have to tilt your head quite a bit. I drink cans of Coke all the time with it.
3. Summer-Fall 2015 is the latest estimate I've read on the OR forums.
4. Absolutely none whatsoever, and it's not that I'm immune to it. I get it in two minutes while trying out War Thunder, and got it with all games in my old DK1. The DK2 is much, much better in this regard. I've played ED for four or five hours at a time without taking off the DK2 and never felt anything other than the pure joy of flying through the Universe