I'm fortunate to have an automotive bookshop within driving distance and stopped by the other day.
On the shelf was a book about BMW i that I've never heard of before, BMW i Visionary Mobility:
https://www.hirmerverlag.de/us/titel-1-1/bmw_i-1673/
I bought the only one they had in stock for a fellow i3 owner. It's a beautiful, heavy hardbound volume of 240 pages and as it was shrink-wrapped (and a gift) I haven't opened it but do check this out if you're interested in i.
I placed an order to have my own copy and will reply back here once I receive it and have had a chance to flip through its many pages.