Today a user on NeoGAF named RazorUK got into the Titanfall beta code and it was revealed that Titanfall would include 14 maps at launch.
Now this is strictly a rumor at this point since there hasn’t been any confirmation from anyone at Respawn Entertainment regarding the number.
There have been rumors in the past few months with a number like this too. Below are the maps listed:
• Angel City
• Colony
• Fracture
• Relic
• Airbase
• Boneyard
• Corporate
• Outpost
• Lagoon
• Rise
• Smugglers Cove
• Training Ground
• Overlook
• O2
• Nexus
Update: New images of the map have been discovered on NeoGAF:
SMUGGLERS COVE:

BONEYARD:

RELIC:

RISE:

OVERLOOK:

OUTPOST 207:

AIRBASE:

LAGOON:

COLONY:

O2:

NEXUS:

CORPORATE:

TRAINING GROUND:

In the beta right now, Training Ground, Fracture and Angel City are included. So we have confirmation for those at least.
source:beyondentertainment