One of the other issues they have mentioned is that the 802.11 spec requires a minimum speed of 1 mbit. So there is still a gap between what is clearly possible and what they claim to want to do.
Within official specs, yes. However there is an extended range mode that is supported by some chipsets.
http://www.qsl.net/kb9mwr/projects/wireless/atheros_XR_whitepaper.pdfI have no idea how common such support is for cell phones, but with a receive sensitivity of -107 db the loss of data rate might actually make this thing workable.