Resourceful hackers have been able to lay bare some secrets about Titanfall (currently in open beta on Xbox One, and semi-open beta on PC) hidden within the code.
According to these individuals the game will feature 15 maps, 13 of which they've found images of (via Neogaf).
Maps: Airbase, Angel City*, Boneyard, Colony, Corporate, Fracture*, Lagoon, Nexus, O2, Outpost 207, Overlook, Relic, Rise, Smugglers Cove, Training Ground.
Modes: Attrition*, Capture the Flag, Hardpoint Capture*, Last Titan Standing*, Team Deathmatch, Variety Mode* (mix of the other modes), Campaign Multiplayer
Of course, the presence of strings of code in a beta is not necessarily confirmation that all these maps will be available at launch.
* available in the beta.