There are new versions (v2.1) of both the standard and NoIR camera modules on sale as of this morning (see http://raspi.tv/2016/new-8-megapixel-raspberry-pi-camera-2-1-launches for some brief coverage). The new modules use the Sony IMX219 sensor (also used as the front-facing camera in the Xiaomi Mi4 phone), rather than the Omnivision 5647 in the old modules.
What (if any) are the major differences between the new and old sensors? Is one better than the other for low light images, for example? Are there any power consumption changes? Are there any capabilities on the new board which were not previously available (or vice versa)?