According to multiple leakers, Treyarch's 2025 Call of Duty entry will be similar to the upcoming Modern Warfare III in that it will feature a map pool comprised of maps from fan-favorite Black Ops 2.

The details:

According to Twitter leaker @el_bobberto, the current plans for COD 2025 appear to be to release remasters of older maps from Black Ops 2, similar to how MW3's map pool will be a full remastering of 2009's MW2's maps. They also stated that it is "very likely to change within the next 2 years," if Activision takes a different approach.
Another reliable insider, @TheMW2Ghost, quoted the original tweet and stated that they had heard similar rumors about the game's map selection. It's unclear how many maps from Black Ops 2 will return if Activision decides to go ahead with the idea, but it's most likely the 14 base game maps that were available when the original title was released in 2012.
So far, fan reaction to the remastering of maps for MW3 has been positive, despite many fan criticisms of its multiplayer map designs in recent years, even though they're reportedly being updated to add doors and other new mechanics. However, unlike Infinity Ward, Treyarch has remastered many of its best maps in the past for more recent releases such as Black Ops: Cold War, potentially leading to its map pool becoming stale shortly after launch.

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Treyarch’s 2025 Call of Duty title will reportedly include remastered Black Ops 2 maps