Without spoiling the comics, the episode count suggests that Season 3 will likely focus heavily on the consequences of Mark’s multiverse encounter with Angstrom Levy. The 8 episodes will likely cover:

"Alright guys, what do you think? 8 episodes? 10? Or maybe 12? Let's guess!"

Fans will remember that Season 2 was split into two distinct parts (Part 1 had four episodes, and Part 2 had four episodes), separated by a grueling months-long hiatus.

In the finale’s climactic scene, Mark Grayson, broken jaw, one eye swollen shut, faces the Conquest variant. The screen goes red. The sound cuts out. For seven minutes, there is only the wet crunch of fists and the gasp of a boy becoming a weapon.

Unlike Season 1, which dropped three episodes on day one, Season 3 is adopting the now-standard weekly release format:

Invincible Season 3: Release Schedule of All Episodes ... - IMDb