This is an especially stupid argument.
They are going to try to release the album at some point this year. Fall, autumn, winter, whenever. It makes much more sense in every way possible to release it this year opposed to early next year. If they aren't happy come fall? Guess what, they won't release it!
Honestly, who cares about which source is right? If you really thought all along that the Billboard report was canon, and that U2 were no matter what going to release the album in 2015, then you're silly. If you think that U2 are going to drop a surprise release on us in the near future, you're equally silly.