It's been out for a few months already, but I just heard about it today. Those of you familiar with Reason's Thor will see some similarities in the GUI at least....maybe that's why it's called Odin?
It's open source, which means that those of you are coders and want to modify it are free to do so. Open source also means it's free. Here's the link.
VST3 (no VST2), AU and LV2 for Linux.
A crazy 84 minute video walking through it for the first time
I listened to Hatfield and the North at Rainbow. They were very wonderful and they made my heart a prisoner.