"Free Fall's close-quarters combat and frenetic action are thrown into overdrive as the ruined skyscraper continues to fall throughout the match, an example of Call of Duty: Ghosts' new dynamic multiplayer events," reads the map's official description. "With every drop, the accompanying shockwaves cause further destruction, disrupting sightlines and constantly evolving paths and chokepoints as the map changes in real-time."
As you can see in the announcement trailer above, this shifting landscape adds a novel twist to typical Call of Duty firefights. On the one hand, the collapsing building can occasionally provide useful cover or a comfy spot from which to snipe your foes. On the other, you may occasionally be crushed by giant chunks of concrete, torn apart by worryingly agile militarized dogs, or casually walk through a formerly intact window.
If this trailer has convinced you to pre-order Call of Duty: Ghosts, you can find everything you need at the game's official website.