If there truly is a Fallout 4, I hope it takes more from New Vegas than 3. 3 had very little of the humour of the isometric games and, as far as I'm concerned, was less of a Fallout game as a result.
I can't wait for Fallout 4 to come out for the sole reason that every time G asks Kinect to play the game, he'll be confronted withe the option to watch Hollyoaks again.
Yeah I hope it isn't cross gen but doubt very much it will be anyway.
E3 2015 announcement Will hopefully mean q4 2016 release at the latest, next gen will be well established by then.