Its really a shame that they aren't making the 30kwh pack backwards compatible. This is really gonna sting for resale of the Leaf. We paid so little for our 2015 S that its not a huge deal, but I'd be willing to bet that once the federal rebates run out and they feel that they've been able to sell enough new cars, the early Gen 1 leafs will be offered the 30kwh pack, but this won't be until about 2019 or so. By that point there will be a significant negative environmental impact to having a lot of used leafs with no range left (basically scrap by 100K miles) and there will also be more profit margin in the batteries, so that selling a 30kwh pack at $7500 would actually yield a decent amount of profit. Or better yet, there will be 3rd party mechanics and battery options, so we can tell Nissan to go to hell and put them in ourselves.