Fallout will probably be 2016. Seems too late for a 2015 release when you consider how long the typical announcement-to-release window is for games that are this massive, took this much time to make, and can gather this much hype. It's marketing. They want to maximise attention. Skyrim was a 1 year wait, so there's no reason for this to not be.
Todd Howard mentioned in an earlier interview how he wants to shorten the gap between reveal and release. Q4 2015 is still possible.