These are MEMS mics, interesting to see them moving outside of the cellphone area. Zylia uses 19 of them in their surround-sound sphere, they don't sound bad but I hope improvements in the tech continue to be made. At AES last month I saw a booth for a company developing MEMS speakers (!) mostly I think for in-ear monitoring and hearing aids, but they didn't have anything to show and though I signed up for further info I have not heard form them.
Jeff