From the fanday: yes, it's still the plan to release the alpha this summer (technically summer lasts until September 21st). It might be a tweaked build they have used during the kickstarter campaign or a different build. Nothing is set in stone. The month delay on the release of Dragon Commander has put a setback on DOS, but their attention is now completely on DOS. So expect to hear an update soon.

Also, the game is still to be released this winter. Originally in November, but as Dragon Commander was late add a month to that for the earliest release date, so December 2013.

The game is from a technical point a view completely done. It only needs content and still lots of it. So there will certainly be a beta before the release too.