We haven't heard anything about Carnage yet.
Along with update patch 1,002,000, a developer menu was discovered in Spider-Man 2, accidentally left by Insomniac Games employees. While exploring the menu, players found mention of unannounced Beetle DLC.
The menu mentions the Beetle's nine-item story arc. As the titles suggest, players will deal with a hostage situation and an ambush, ending with a boss battle.
The fact that Spider-Man 2 may receive DLC about the Beetle became known thanks to a leak of internal data from Insomniac Games. The DLC was supposed to be free and would introduce a boss to Spider-Man 2 along with an open world mission.
There has been no official announcement about the release of DLC about the Beetle. According to the leak, Spider-Man 2 will also receive Carnage DLC and Spider-Man: Into the Spider-Verse-themed DLC.
This is interesting