Where did you hear that, from what I understand, they are not locking out devices that is just a rumor started by someone who missunderstood a press release of Verizon's, what Verizon ment was that when the Family Data Share Plans roll out (Which will be before the offical OTA ICS build release), Verizon is doing away with the tether fee, and allowing us to go ahead and tether our phones. They believe that enough people will upgrade their phones to give enough play room on server load due to them being moved to tiered data, to accomodate those who want to tether, not to mention the FCC is looking at leaning against Verizon in their dicision of blocking tethering being a violation of the C-Block agreement, as they have done so resently on similar issues with other companies.
*Edit* From what I hear you don't have to do the Entitlement Check SQL Edit, from what I understand ICS doesn't use that value in it's database, it is there, but it doesn't use it.