Thinking about this a little more, and extrapolating on the end of LoK, we might have winged 'jetpacks', civilian mechasuits, and maglev bullet trains as standard. Spirit Vine energy might be developed into a clean power source, or more likely abandoned/academic only after Kuvira blew a whole between dimensions accidentally, that technology taking a similar path to nuclear in our world. Cars would be probably still rely on internal combustion, if cleaner, and there would be a large-scale passenger airplane industry (KorraSato Airlines, anyone?).

They might skip guns, though, if only because bending and electrical 'tasers' were already in place and that was more or less accidental in our own timeline.