http://www.hollywoodreporter.com/live-feed/timeless-saved-cancellation-as-nbc-reverses-course-season-2-renewal-1003568NBC changed their minds; Timeless will get a 2nd season. It'll only be 10 episodes, but it should give them a chance to draw everything to a conclusion. :)
The series is produced/owned by Sony, not NBC. That may have hurt its chances for renewal.
The other networks' time travel shows were also canceled; they're not coming back. :(