Action RPG Contingent from developer Dark Age Studios seems promising, with a planned Kickstarter coming sometime soon and Linux support is planned.
Take a look at some shots:
When asking about Linux support, the developer said this:
We plan to support Contingent on both Linux and Mac OS. The more people that can play, the better! (plus I'm a big fan of Linux)
Always nice to find another Linux fan amongst all the developers we speak to.
What's interesting, is that it will be mixing in traditional action-RPG mechanics with larger strategy elements too, with you being able to order troops around and lay siege to enemy settlements and villages. They say it will have the "tried and tested" combat system, with advanced combat techniques and a dynamic wounds system.