Trusted sources told us that the NEX-5R has a new 16 Megapixel sensor with phase detection AF pixels on sensor! This is pretty much the same technology used by the new Canon EOS-M mirrorless camera (click here to see that cam) that also uses those kind of pixels. It allows a super fast autofocusing and more reliable tracking of moving objects while the contrast autofocus is more accurate. Combine that and you have an almost perfect autofocus!
It’s not confirmed yet but the NEX-6 could use exactly the same sensor!
P.S.: Last year we spotted a Sony patent describing that technology (Click here to read it).