Some random info I've collected since E3, may be good to add to the OP:
Release date confirmed for 10th November 2015.
QuakeCon have a Fallout4 presentation on 24th July 2015, but only people physically there will get to see it. The events for FO4 will not be streamed, but is hoped will be available at a later date.
Fallout Shelter is expected to be released on Android in August 2015. Exact date TBC.
Pipboy editions for all versions of the game are now completely sold-out worldwide. Bethesda will not be making any more. You may get lucky if retailers have orders cancelled and put them back up for sale. The only UK retailer for Pipboy editions is GAME.
The Pipboy edition comes with exactly what has been listed on the store page. It will not come with any DLC.
Fallout 4 is a SteamWorks game and will require Steam regardless of where you buy it. People who have bought the physical DVD copy will have a Steam code and can download the entire game through Steam if they want to.
Minimum system specs for FO4 will be released around one month prior to release.
Fallout Mystery Minis (12 variations) will be available ‘this fall’.
http://m.uk.ign.com/articles/2015/07/07/comic-con-funko-reveals-fallout-vinyl-toys We should expect these to be available in the UK.
The maximum size phone that will fit in the Pipboy (without any foam inserts) is 141.2mm x 71.6mm x 10.2mm. The Samsung Galaxy S6 is slightly too big, but S4 and S5 will fit.
The Pipboy will not have any platform branding, so PC, XB1 and PS4 versions will all be identical.