According to Verizon's official Twitter account, Thunderbolt users will in fact get to enjoy another month of free mobile hotspot, presumably thanks to the Charge's delay and subsequent promo of its own:
@VZWSupport: @mgluna The free Hotspot offer has been extended through June 15th and includes Thunderbolt users. *CM
Now that Thunderbolt and Charge users are on the same page, it looks like Verizon's ready to price the LTE hotspot feature post-promotion with the same structure currently in place for its 3G hotspot:
@VZWSupport: @jthomas99 The cost of the Hotspot Feature is $20.00 for a 2GB allowance once the promotion ends. *CM
Remember, blowing through 2GBs on LTE will be a much quicker task than on the 3G network, but we won't get too antsy until we see it in written in stone. With that said, is $20 worth it? Who'll be signing up on June 15?
Thanks everyone who sent this in!
Update: And now it seems that Verizon has backpedaled a bit, and is saying that information about the hotspot is not available:
@Broadwayblues That information is not available. Please sign up for email alerts about new products & services at https://www.androidcentral.com/e?link=https%3A%2F%2Fwww.anrdoezrs.net%2Flinks%2F100048248%2Ftype%2Fdlg%2Fsid%2FUUacUdUnU15598%2FHTTP%3A%2F%2Fwww.verizonwireless.com%2F&token=4_4T5vPR *VS
Maybe *VS and *CM should meet at the water cooler and have a chat?