Verizon

While we can't be sure of anything until after it happens, supposedly starting July 7 Verizon will be offering three different tiers of data in lieu of their current unlimited offerings -- 2GB for $30 monthly, 5GB for $50 monthly, and 10GB for $80 monthly.  A tethering package will cost an additional $20 for 2GB of tethered data, and overages check in at $10 per GB used.

This shouldn't really surprise anyone, as Verizon has hinted that they would be switching to tiered data plans and even revamped things a bit last fall. The important thing to remember here is that if you currently have an unlimited plan, this won't affect your current contract, and it's very likely that you will be able to continue month-to-month at your current rate and plan. 

Source: Droid-Life