Even Google doesn't seem to "know" about the Mio 188 that site visitor "cim" kindly introduced to us today with a couple of pictures!
No specs at this point, but Mio, who shot to "GPS PDA fame" with the Mio 168, the first PocketPC with a built-in GPS receiver, seem to have shrunk the GPS antenna to the point of making it barely noticeable and are using a "symetrical design" for the PDA that allows for "natural" landscape use, like on the iPAQ hx4705. Full size pictures in discussion thread!