Game had to be rebuilt in a new engine, legal issues. Sypheria occasionally streams on twitch when he's working on the coding.
1. Yes it's right HERE
2. Not sure, it's still possible to add to your pledge so maybe… I'm too lazy to check my reward page to see if I can purchase additional stuff
3. No and no. No you won't have to pay more that $25 is for your eventual steam key and no because there is currently no public access due to the whole restarting in a new engine
Second 1 - 3. No the dime system is something every player must balance themselves, including the "sub class" npc's. You can't focus solely on the military part of dime but you will go bankrupt since you need to fund your war. Now you can still be all war so long as you have a economy player (who focuses solely on financing) playing you, this can allow/create an actual micro economy within the game which there have been talking about forming actual governing body through alliances and contracts between alliances. The "sub classes" are no sub classes in a traditional MMO, for starters they aren't sub classes. Pirate, smuggler, demon hunter yatta yatta are NPC's that should be treated much like any other player in the game because that is what they are. They follow the same dime system we will and so they much also balance it through trade, information gathering, military expansion and deals/quest giving. Unlike players however they will never fully be erased and probably have access to unlimited resources.
And 4. As I said earlier you can specialize in one or more of the dime system so long as you have external sources to balance you out over all. And intelligence player for example can sell off the information the acquire, the new protocol system is an excellent example of how intelligence can play a huge role. However if you focus only on intelligence your armies will be cannon fodder, your research/tech will be slow to advance and you may end up with more enemies then you had hoped. There are/will be alliance that are open to having "departments" where groups of players focus on this or that and over all balance each other allowing each person to play to their strengths. Hope that answered all your questions