Day of Infamy is developed by New World Interactive, the same studio responsible for the Insurgency game that's also had Linux support. Day of Infamy is powered by the Source Engine, so the Linux support is in good shape. The SteamOS/Linux system requirements list a GeForce 8600GT/9800GT as being supported or Radeon HD 2600/3600 graphics. Their recommended GPU is any card with 2GB of more of vRAM. So assuming those system requirements are accurate, the game is pretty lax on modern hardware.
Yesterday NWI released a game update for those enjoying the title in early access. That significant update has a new co-op difficulty, a new air support option, new music, updated ragdoll physics, and much more.
That's when they also confirmed the game is officially launching in two weeks on 23 March.
More details on this $20 World War II first person shooter game over at the Steam Store.