This small form factor cam supports all Panasonic/Olympus MFT lenses.
The E1 will be the smallest 4K camera with interchangeable lenses. It's slightly larger than a GoPro Hero4 which is not bad considering you can change out the lenses. The camera records in cinema quality 4K which is 4096 x 2160 at 29 fps. It uses a Panasonic sensor and an Ambarella A9 image processor. The E1 features WiFi, bluetooth LE and a removable 2,000 mAh battery that can last up to 45 minutes when shooting in 4K with WiFi turned on.