What’s new in Tornado 3.0¶ Mar 29, 2013¶ Highlights¶ The callback argument to many asynchronous methods is now optional, and these methods return a Future. The tornado.gen module now understands Futures, and these methods can be used directly without a gen.Task wrapper. New function IOLoop.current returns the IOLoop that is running on the current thread (as opposed to IOLoop.instance, which return