Let's start with Legion, which reportedly already has a pilot order and is being written by Fargo writer/creator Noah Hawley. In other words niiice.
From The Hollywood Reporter:
The Legion pilot introduces the story of David Haller, a man who may be more than human and who has has struggled with mental illness since his teenage years. Diagnosed as schizophrenic, David has been in and out of psychiatric hospitals for years. But after a strange encounter with a fellow patient, he’s confronted with the possibility that the voices he hears and the visions he sees might be real. In the comics, David is the son of X-Men founder Charles Xavier (aka Professor X) and Israeli Holocost survivor Gabrielle Haller.
And here's Variety's synopsis of Hellfire:
Fox’s “Hellfire” is set in the late 1960s and follows a young special agent who learns that a power-hungry woman with extraordinary abilities is working with a clandestine society of millionaires, known as “The Hellfire Club,” to take over the world.
Whether or not Singer, who is directing the upcoming X-Men: Apocalypse, is thinking of any sort of tie-in between the films and TV shows is anybody's guess, but the possibilities are huge.