@painfullpacman Yes. But not soon.
— Dong Nguyen (@dongatory) March 19, 2014
As you can see that, Nguyen haven't gave any timeline of return, and also says that it is not soon, means developer are trying something to introduce into the game. This is confirmed that won't be grounded for long time, and will return to its fans.
So we can wait for the further updates to come from the Nguyen, a flappy bird developer. Anyways this is a great news for all the Flappy Bird lover that Nguyen left the door open for a Flappy Bird return