So, running this down and comparing it with the original...
- Chapter 1: The Destruction of Mako Reactor 1
- Reactor 1 Bombing Mission / Escape
- Chapter 2: Fateful Encounters
- Meeting Aerith / Return to Seventh Heaven
- Chapter 3: Home Sweet Slum
- Seventh Heaven / Sector 7 Slums
- Chapter 4: Mad Dash
- Sector 7 Station / train sequence?
- Chapter 5: Dogged Pursuit
- New bike chase sequence?
- Chapter 6: Light the Way
- Tunnels / Sector 4 Plate?
- Chapter 7: A Trap is Sprung
- Reactor 5
- Chapter 8: <>
- ???
- Chapter 9: Budding Bodyguard
- Sector 5 Slums / Aerith's House / Sector 6
- Chapter 10: The Town That Never Sleeps
- Wall Market
- Chapter 11: Rough Waters
- Sector 6 Sewers
- Chapter 12: Haunted
- Train Graveyard
- Chapter 13: Fight for Survival
- New Seventh Heaven under attack sequence?
- Chapter 14-1: A Broken World
- Sector 7 Pillar battle?
- Chapter 14-2: In Search of Hope
- Sector 7 Pillar aftermath?
- Chapter 15: The Day Midgar Stood Still
- Climbing out of the slums?
- Chapter 16: The Belly of the Beast
- Infiltrating Shinra HQ
- Chapter 17: Deliverance from Chaos
- Escape from Shinra HQ
- Chapter 18: Destiny's Crossroads
- Highway chase and escape from Midgar
Seems like it's sticking pretty close to the original sequence of events. I'm not sure where exactly some of the new sequences we've seen in trailers will fall into place, but it seems to me like the bike chase could be incorporated into the mission to destroy Reactor 5 in the tunnels. Think maybe the new sequence with Seventh Heaven under attack might take place instead of just arriving to the Sector 7 Pillar battle already being underway. Maybe the parachuting sequence will actually be part of the Sector 7 Pillar battle, since it's clearly happening at night?