Rumblings in our Verizon FiOS forum and the official Verizon forums over the last week or so indicate that Verizon will be tinkering with their FiOS speed lineup starting on June 21. According to self-proclaimed insiders, Verizon reps are supposed to keep mum on the changes until this Saturday. At that point, it looks like customers on existing tiers will see some slight improvements -- users on 10/2 and 20/5 jumping to 15/5 and 25/15 is given as one example, but nothing's been confirmed yet. Insiders seem to suggest the new tiers won't be advertised at first, and will require a contract extension. We asked Verizon for comment on the rumors and were told the carrier "has nothing to announce at the moment."