In future DLC packs perhaps?
According to DICE’s Lars Gustavsson in a recent video interview at Gamescom, that could be the case. As of now, it’s on a list for ideas and since not all the DLC content has been finalized yet, it could appear as an additional mode there. “I love Titan mode and who knows in what form it might return in the future”.
For those unaware, Titan mode was a sort of Conquest mode in Battlefield 2142 in which both teams had huge, flying bases called Titans. Opposing team members must fire missiles at the enemy Titan, thus lowering it’s shields, before boarding it to take the whole thing down. Missiles could be fired from various control points across the map. The mode was criticized at the time for not supporting bots and being way too big for such a large number of people to take part in.
However, with large teams being commonplace now, it doesn’t seem like it will be a problem for Battlefield 4. It releases on October 29th in North America for Xbox 360, PS3 and PC with next gen releases due in November.