Covart
Android Enthusiast
Only it's not coming from Samsung. A Chinese company, named Zens, is producing a replaceable battery cover with the required hardware installed and a 'Touchstone' esque charging station. One nice feature about the charging station is an auto-off feature when the battery reaches full charge.
Press release says Sept release. Link is here:
ZENS. How it works for samsung galaxy s3
Press release says Sept release. Link is here:
ZENS. How it works for samsung galaxy s3