They are giving away a special space suit to anyone who pledges before the new site as well.

https://robertsspaceindustries.com/introducing-your-rsi-space-suit/

Raw Kryptonite, there is a 4 stage release planned. Stage 1 (September 2013)is a hanger module where you can walk around and go into all of the ships you bought. They were even talking about making it MP so you can invite your friends to see the ships you own. Stage 2 (December 2013) will be a dogfighting deathmatch game (to test the net code) and they will slowly build that up and release the Stage 3 beta for the squadron 42 (military mission mission based game) and release it Q2/3 2014. Then stage 4 which is the open world MMO 2015.

So it looks like this

Sept 2013 Viewable spacecraft module
Dec 2013 Dogfight Game
Dec 2014 Squadron 42 (Mission based game)
Dec 2015 Open world MMO

I am sure those dates are all subject to change though. They could land sooner since they made about 3 times they money they thought they would or they could extend since delays in game development are like flies on Shi....