http://www.mydroidworld.com/forums/content/1009-tiered-data-go-live.html
Read the rumor as all you wish. If you want to get a 4G device with unlimited data on the actual device get it activated before 7/711 because that's the rumor right now.
BBCrackman and other rumor leaks out of VZW by MyDroidWorld.com have been pretty accurate in the past.
7/7/11 = Activation of Tier 4G Device billing in VZW's billing system.
Take it with a grain of salt. 