Check the tentative schedule of what is being included when. In there is says
"June 2014: Alpha 3 - Starports and more!
We’re adding some big features and making huge changes to a few more with this alpha release. This includes larger maps, improved AI, starports, multiplayer fixes, an improved ship designer (based on your feedback from Alpha 2), resources, performance improvements and numerous UI updates."
Note please, that this is a tentative schedule.