We already knew BATTLETECH was coming to Linux since the Kickstarter, but it's good to see Harebrained Schemes continue to mention Linux support is important.
The developers behind Underworld Ascendant gave a lot of weird mixed messages about their RPG being on Linux, thankfully they've now cleared it up properly.
Do you love strategy games? You might like to take a look at Liberation Circuit, a free software (GPL) RTS that includes optional programming elements.
Tales of Maj'Eyal, the roguelike RPG that features tactical turn-based combat is set to expand, allowing you to explore horrors that lurk beneath the surface with the Forbidden Cults DLC.
May is already turning out to be quite a busy month for Linux gaming. It's now confirmed that the group based role-playing dungeon crawler Arakion: Book One will arrive in Early Access on May 15th.
I'm a huge fan of monster taming RPGs and seeing more of them get released on PC with Linux support is great. Siralim 3 is another that will have a Linux version.