I guess manufacturers are learning from S3 success to release new accessories ASAP
I see that Anker just released their 5200 mAh extended battery with either Dark blue or White battery covers, NFC support, and their typical 18-months warranty. Pretty good value for $17.99 shipped.
Amazon.com: AnkerŪ 5200mAh Extended Battery for Samsung Galaxy S4, GT-I9500, With Dark Blue Back Cover, with NFC/Google Wallet [18-Month Warranty]: Electronics
I can only judge by their S3 and N2 performance and reliability, and typically these batteries offer even slightly higher capacity than labeled.
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of all smartphone and tablet Accessory and Gadget REVIEWS by Twister