
According to the LinkedIn page of a former programmer, Firaxis may be working on an unannounced game, alongside the recent expansions for XCOM: Enemy Unknown and Civilization 5.
Christopher Haire worked on Civilization's browser-based Facebook spin-off CivWorld, as well as an unannounced title built with the Unity engine, before he left to join casual games behemoth Zynga.

Firaxis' Ed Beach and Dennis Shirk talk major overhauls in "Test of Time" update.

Today Take-Two Interactive Software announced new sales figures for Red Dead Redemption 2 and Grand Theft Auto V during its quarterly financial conference call. They also teased the future of Firaxis.
I wonder why EA never made a GTA clone considering they bought so many game developers and have so many licenses
Rather have GTA 6 instead of milking the same game since 2013

Nobody expected a new XCOM game getting announced for this year, and released so quick. And with quite radical changes, developer Firaxis has to temper expectations by stating it’s a spin-off, and it’s sold for cheap.
Like an FBI raid squad, XCOM Chimera Squad kicked opened the doors hard, and hits you strong and fast.