It's called XCOM: Legends.
While Firaxɪs ɪs presumably ʙᴜsʏ wᴏʀkɪɴg ᴏɴ tʜᴇ ruᴍᴏʀᴇd ᴛᴜʀɴ-bᴀsed Marvel ɢᴀᴍᴇ, a studio cᴀʟʟed Iridium Starꜰɪsʜ hᴀs sᴏꜰt-launcʜᴇd ᴀɴ ᴏꜰficial XCOM spɪɴ-ᴏꜰf ᴏɴ tʜᴇ Google Pʟᴀʏ stᴏʀe. XCOM: Legᴇɴᴅs ɪs sᴛɪʟʟ ɪɴ ᴅᴇᴠᴇʟᴏᴘᴍᴇnt ᴀɴd ᴏɴly availᴀʙʟᴇ ɪɴ sᴏᴍᴇ terrɪᴛᴏʀies, ʙᴜᴛ ɢᴀᴍᴇpʟᴀʏ ꜰᴏᴏᴛᴀɢᴇ ɪs sʜᴏᴡɪɴg ᴜᴘ ᴏɴ YouTuʙᴇ alʀᴇᴀᴅy.
The first thing to note about XCOM: Legends is that it's played vertically, and the second that, while it is turn-based, the only movement or positioning involved is deciding which of your heroes to put behind cover as they rush from one five-on-five encounter to the next. Also, repositioning has a five-turn cooldown.
XCOM: Legends is set in the XCOM 2 timeline, and has various familiar faces of the resistance pop up between missions. During the tutorial you discover an alien device called the Archway. What does this powerful psionic tech do? It lets you summon legendary heroes or artifacts in exchange for premium currency. XCOM: Legends is a gacha game where you supplement your regular squaddies with more powerful premade characters.
When you're not playing, gear and resources from the battlefield are collected by the "Integrated Drone Looting Experience", or IDLE for short. Just typing this sentence has made me feel deep-down tired in my bones.
Of course, if you want an XCOM game on mobile both XCOM: Enemy Within and XCOM 2 are already available, as are plenty of other neat turn-based games like Hoplite.