I couldn't really decipher what he was trying to say or what he meant by "C". Both Verizon and Sprint are at EVDO rev A for 3G so there's absolutely no difference in what standard the two use. EVDO's latest is up to rev B with a speed increase, but Verizon has chosen to not implement this and just jump to LTE. Sprint has WiMax in the 2.5GHz range, but only in a few select markets. It would appear that this FCC approval covers the two CDMA bands, bluetooth, and wifi. No WiMax as far as I can tell so it's probably not the Supersonic unless that phone ends up being 3G only.
Not to digress, but Verizon better get these phones out soon. With 40"+ on my 150ft driveway (I'm still clearing last weekend's snow), a snowblower has surged to a very close #2 on my list of discretionary purchases. If Verizon doesn't get something to market soon, and mother nature doesn't take a f***ing break, the Incredible or Nexus One might get bumped.