The HTC Butterfly S is also expected to feature BlinkFeed, the screen that shows a visual representation of your social network feeds. There also is the possibility that the camera on the back of the device will use the same UltraPixel technology found on the HTC One. This uses a smaller number of larger-sized pixels, allowing more light to infiltrate the sensor resulting in better pictures under low-lighting conditions.
The HTC Butterfly S is expected to be unveiled during an HTC event on June 19th, along with the entry-level (but impressive sounding) HTC Desire 600.
source: VRZone, EngadgetChina (translated) via SlashGear