Currently the 40 kWh Leaf goes for $30k or so and according to CarsDirect, they believe the 60 kWh variant will go for about $5,500 more:
https://www.carsdirect.com/automotive-news/60-kwh-nissan-leaf-may-cost-5-500-more-than-40-kwh-model?src=20&lnk=TnL5HPStwNw-gynABzvCmULJJys8vzdSOw
https://www.carsdirect.com/automotive-news/60-kwh-nissan-leaf-may-cost-5-500-more-than-40-kwh-model?src=20&lnk=TnL5HPStwNw-gynABzvCmULJJys8vzdSOw