The Unity game engine and development platform has reached the 4.0 milestone and is now available for purchase with a slew of new features onboard. Headlining the update are DirectX 11 support, new animation tools and an add-on for publishing games to Flash. In addition, Tux is getting some love with a preview of a deployment option for publishing games to Desktop Linux. Sure, a landmark release might seem like a good time for Unity Technologies to cool its heels and slow down development, but a respite isn't on the roadmap. According to the firm's CEO, David Helgason, Unity 4 will see a faster paced schedule and more frequent releases than the platform previously had. Developers can snag a free version of the software or shell out at least $1,500 for a professional license. For more details on additions and improvements to the engine, hit the jump for the press release or tap the second source link below for the complete rundown.