We don't know if life forms naturally given the right conditions--I wouldn't bet against it. But if there is life elsewhere, most of it may be of an extremely simple form. Supposedly life first appeared on earth four billion years ago, but the first multi-cellular life was not until 600 million years ago. More than three billion years with just one-celled forms of life.
Depends on whether the planet survives. Google says a planet orbiting Betelguise will lose at least 4km of it's surface, vaporized to space. Good chance it will be an ex-planet.
But if it survives, and is no longer orbiting a remnant star, then it's a "rogue" planet. Filled with beautiful women with white streaks in their hair and able to drain your powers and life force with a single touch.