DU's post has me disappointed. There's no need to lay into Obsidian like that.
Estimated Delivery: April 2014
That gives them 19 months.
Arcanum, a brand new IP with new combat engine, story and setting, took 3 years to develop and was still very buggy and unpolished on release, with what felt like a rushed ending.
Temple of Elemental Evil, a video game based on a pre-existing setting, with an already established rule-set (D&D 3.5) and every major story element already designed, took Troika 2 years to complete and was still buggy and felt unfinished.
Fallout: New Vegas, with a pre-built combat engine, game mechanics and pre-existing world, based on an already defined IP, was announced in April 2009 and released in October 2010. Indicating a development time-frame of at least 17 months.
And they had a complete construction set and tools for that world, ready to go. All they had to do was script and add the content.
Obsidian have given themselves 19 months. That means they sat down and went "how much time do we need, because that's how long we're going to have to pay people for, in order to develop the game. And we'll need to raise money based on that time-frame." And they came up with 19 months.
Incidentally, I suspect Wasteland 2 will have the same problem.