If we go back a year to the release of Titanfall, you may remember all of the frustration over the Titanfall Xbox One exclusivity deal. Because of the huge amount of hype behind the game, Respawn Entertainment managed to sell quite a few Xbox's for Microsoft, but despite this, rumors kept spreading that Titanfall 2, a game that is definitely in the works, will not be an Xbox exclusive, despite the status of it's predecessor.
Of course, at the time there was no proof that Titanfall 2 would be available for any console other than those owned by Microsoft, but shortly after Respawn did mention that they would not have to be locked down to Microsoft's system with their next games. This instantly made many people believe that Titanfall 2 was headed for cross-platform, and there wasn't much to deny it.
To further cement the rumors that Respawn Entertainment will be ending their exclusivity deal for Titanfall, recently the Respawn developers were spotted at the PlayStation conference, an event that was held to celebrate the 20 year anniversary of the console line.
It would be odd to think that a third party Xbox exclusive development studio had reason to be at the conference unless they were in talks with Sony to bring Titanfall 2 to the PlayStation 4.
Personally, I think Titanfall 2 will come to the PS4, but I doubt the game will be made exclusive to Sony's system, despite certain rumors. I think that the Titanfall franchise will remain cross-platform going forward, and any attempts to make it exclusive by either side of the console war will most likely be ridiculed by the gaming community.