"user-initiated events" in multiplayer.
They also mention floods and earthquakes that can "fundamentally alter the flow and strategy" of matches. Activision also teases an exclusive weapon camo pre-order from Gamestop.
If you pre-order Call of Duty: Ghosts today via Gamestop then a special Ghosts camo is available to use today in Call of Duty: Black Ops II, which is the game footage shown.
Thefor COD: Ghosts has been updated to include a full description and feature-set.
"Armed with a new next gen engine, Call of Duty®: Ghosts redefines the franchise’s hallmark multiplayer experience. Dynamic maps bring earthquakes, floods, and user-initiated events that fundamentally alter the flow and strategy of every fight. Also, with unparalleled character customization, players have total control to tailor-make their soldier. These are just two of the many innovations going into the Call of Duty®: Ghosts multiplayer experience."
Call of Duty: Ghosts releases on Xbox 360, PS3 and PC November 5th.