At the moment, I can't say I am particular excited by Fallout 4, but I am holding onto what optimism I can. The main stories in all of Bethesda's most recent titles have been horribly linear. The player has no sovereignty over the direction of the narrative which is the singular strength of video games as medium for story telling. And this glaring weakness wasn't helped by the combat-driven quest solutions.
What Fallout 4 desperately needs is to follow the direction that Obsidian took with Fallout: New Vegas. That is, focus on choices, reactivity, dialogue, and various quest solutions. Bethesda should look to improve upon the framework of Fallout: New Vegas, just as Obsidian improved upon Fallout 3, and if they do Fallout 4 might just be a really damn good game. If it turns out to be Fallout 3 version 2.0, well, it could still be a good hiking simulator... I guess.