It has been a year after the Inferno map had its revamp, and now it replaceable the long timed played Dust 2 in the Active Duty map rotation. However, the map can still be played in the deathmatch and casual modes.
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In the blog post that announced this, it states.
In the wake of the ELEAGUE Major (congratulations Astralis!), we’re making a change to the map pool: Inferno has returned to Active Duty, replacing Dust II, and will be featured at the next CS: GO Major. As in the past, the updated Active Duty pool is automatically selected when you enter Matchmaking.
And in Casual and Deathmatch game modes, it’s now a bit easier to play your favorite maps. Map groups have been separated into additional categories: Active Duty, Hostage, Reserves, and Dust II.