Wi-Fi Alliance draft test spec is -82 dBm; Verizon wants -72 dBm. Neutral parties think -82 dBm is much too high. These are log scales; even a few dBm are a big difference. Mike Calabrese, one of the best in D.C. claims Verizon-Qualcomm LTE-U plans will interfere with as many as half the Wi-Fi connections unless it backs away well below -80 dBm. (Below) He uses the chart here from Broadcom, which I'm told is based on CableLabs data. New York City says testing on their fast-building LinkNYC discovers problems unless LTE-U backs away if there are signals down to -90 dBm.
Dean Brenner of Qualcomm put out an angry statement that -82 dBm would kill LTE-U, even though neutral parties think it already is too much of a compromise.