Actually this had nothing to do with the Titanfall guys and everything to do with EA. Respawn (the devs) were doing the EA partners program where EA does the distribution and publishing of the game, but the devs (Respawn) retain all rights to the IP and own it. They (Respawn) were not happy when they found out about the deal EA did to make Titanfall exclusive, and even made it pretty clear they weren't happy on their twitter making sad faces. They did clarify on twitter as well that they did not sell the IP to MS and Titanfall 2 will be on on the PS4.
Right now the guys that started Respawn (I can't remember their names Vince Z or something) aren't too happy. They wanted to make a new IP that would be huge for them reaching as many people as possible. This deal EA did directly screws that up. I wouldn't be surprised if after the game is out they quick take care of the DLC and work on TF2 right away and will be making sure that whoever they deal with for publishing wont be dicking them over.
I feel bad for the guys that is for sure though. They left EA because EA dicked them over. They join up with Activision and then leave then after being dicked over. Now they join back up with EA to be dicked over again. I honestly wouldn't have went back to EA after being screwed one time, but I guess they felt good about it and now look