Be aware that there is no formal 'generation' of Leafs, other than the model reference, and the trim levels, so different people call things by different names.
From my experience, for UK Market.
Nissan Leaf ZE0
Japanese-built: 2011-2013
24kWh battery pack
resistive heater
(problematic) electronic parking brake
single trim level, only option being a tiny solar panel on spoiler to keep 12V accessory battery topped up.
Type 1 AC charge port, 3.3kW
CHAdeMO charge port, 50kW
Sunderland-built: 2013-2015
revised battery chemisty, still 24kWh.
Move on-board charger from hump to under bonnet, freeing up space in boot
Charge port lighting.
Dashboard now displays battery state-of-charge as a percentage, rather than just bars and guessometer.
Different trim levels (Versa, Acenta, Tekna)
Heat-pump heater on all but Versa trim levels (increased advertised range)
Replace electronic parking brake with foot-pedal ratchet parking brake.
Type 1 AC charge port, 3.3kW, option of 6.6kW on-board AC charger.
CHAdeMO charge port, 50kW
Sunderland built 2015
Mild refresh
30kWh battery pack as an option, eventually becoming default option.
Carwings rebranded as Nissan Connect EV
Removal of 80% charge limit option.
Removal of 'Google Maps' point of interest search from Satnav.
Removal of user data SD card from satnav.
Heat-pump heater on all but Versa trim levels
foot-pedal ratchet parking brake.
Type 1 AC charge port, 3.3kW, option of 6.6kW on-board AC charger.
CHAdeMO charge port, 50kW
Nissan Leaf ZE1
2017-
Sunderland-built
Major facelift
40kWh battery as standard
Analog speedometer on dash
DAB radio, considerably different user interface on touch screen.
Dashboard can now display rate of charge.
Options for park assist and adaptive cruise control, lane assist (Pro Pilot)
Electronic Parking Brake is back, to support the park assist option.
Type 2 AC charge port, single-phase. 6.6kW on-board AC charger.
CHAdeMO charge port, 50kW
Nissan Leaf ZE1 E Plus
2019-
Japan-built
60kWh battery as standard, different battery chemistry, different battery pack supplier.
Type 2 AC charge port, single-phase. 6.6kW on-board AC charger.
CHAdeMO charge port, 100kW