Japanese iPhone carrier Softbank has announced plans to launch Near Field Communications (NFC) add-ons for the iPhone 4. According to the press release (Translated Link), the polyurethane, Bumper case-compatible “seals” will stick to the back of the iPhone, allow for full access to the device’s rear-facing camera and flash, and use Sony-developed FaliCa NFC technology to enable wireless payments. The seals will be available in WAON-,…