Last month Samsung announced the highest-res smartphone camera sensor ever, the mammoth 1/1.33" 108MP ISOCELL Bright HMX. Xiaomi will be the first company to use this in a shipping device, and so far a lot of rumors pointed towards the Mi Mix 4 being said device, when it launches presumably in October (that would be one year removed from its predecessor's announcement). However, a new investigation by the enterprising folks over at XDA Developers has revealed that the Chinese company is in fact working on four different smartphones that will feature the 108MP rear camera. These are...