For those interested, the source code is on GitHub under a modified MIT license. The engine is open source, but things like 3D Models, Sounds and other bits are proprietary so the game isn't free.
About the game:
DwarfCorp is a procedurally generated, open source fantasy real-time strategy game in which you lead a colony of ruthless capitalist Dwarves to discover new lands, and exploit them for profit!
Dig deep into the earth to discover rare gems and ores, and send them back to the motherland in a balloon or ship. Defend your colony with walls, traps, and mercenaries. Promote your employees for their good work, or give them a slap if they get sloppy. Meet Elves, Goblins, Mole Men, Demons and more! Design your company logo and colour scheme, and watch your company grow.
The game has been in development since 2012, so it's been a while coming. It's only now that they consider it good enough to show a wider audience. It was actually funded by Kickstarter back in 2013, so I imagine backers will be eager to see how far it has come in that time.
It seems like it takes the ideas of Dwarf Fortress and makes them more accessible
Personally, I think it looks fantastic and I'm really looking forward to checking it out. Especially after Castle Story was such a let down. I'm itching for a game like this to build up and explore.