You're right about the luggage space - it's too soon to tell. I only took a duffle bag and a small backpack with me on this trip. When I make my next trip to BJ's, I'll have a much better sense of the trunk space. From specs, the Bolt is larger - 16.9 cubic ft to the Leaf's 14.5 cubic ft. (Note that I had a 2012 Leaf with the "hump" in the trunk which was removed in the 2013+ models, yielding a total of 24 cubic ft). The Bolt's trunk looks smaller, but I have the false floor and the cargo shade installed. I have stowed the false floor, but haven't removed it completely. Again, I will know for certain when I do some serious shopping.
I think the Bolt's overall cargo area (rear-seats folded) is actually a little larger than my B250e, but how it's configured is a compromise for me. I really liked the Spark EV, and while rear-seat legroom was fine, the space behind the rear seats doesn't work for us. The Bolt seems similarly designed for rear passenger comfort at the expense of cargo space. I really like that our dog crate fits perfectly behind the rear seats, something that wouldn't happen with the Bolt. I'm not sure (yet) if that's a deal breaker, or just an inconvenience but I'm looking forward to see if GM comes out with an EV about the size of an Equinox - even if the added size results in a drop in range / efficiency.