Bohemia has a new RTS coming, but it's not just an RTS. Silica is a new "RTS/FPS crossover game" springing onto Steam early access from the Bohemia Incubator, the section of the company dedicated to indie titles and "experimental games".
Silica takes place on Baltarus, a planet far beyond walking distance from Earth, and sees you play "either as a Commander in RTS mode, or as an Infantry soldier who gets to control all units and vehicles along with their arsenal in FPS [mode]". It was "mostly developed" by Martin Melichárek, the lead dev on Bohemia's Take On Mars.