OK, here we go again. Just FYI, there is already a thread or two about this, but I'll see if I can explain this process... again.
First off, I am not, never have been, and, unless some amazing opportunity comes up, never will be an employee of Verizon, HTC, or Google, despite accusations to the contrary. Second, you may want to have a look at this: http://www.htc.com/www/help/android4faq/?cid=android4blog. Third, update release dates are NEVER set in stone until the day it starts pushing to customer's phones. And fourth, this thread, if it follows others of it's kind, will quickly degrade to talks of lawsuits, legality, bloatware, and how Apple is so much better at updates (for the record, not true, they don't give a date until it's ready either, and typically, don't even announce it until then). Oh yeah, and I want the update just as much as anybody else.
Now, the reason the "time frame" was given, as you put it, in the most vague of terms, is because, when that was written, work on the update was only just started, if that. The phone was released only (if even) a month after Google made the big announcement of ICS, and IIRC, before the source code was even released. After the source code was made available, HTC had to download it, then start to make it fit with Sense, then make that work with the Rezound specifically. Once HTC had what they thought was a workable version, they passed that on to Verizon who had to do network testing, then send it back with a bug report. You can see here: https://forums.motorola.com/pages/00add97d6c#legal what Motorola says about this process. This always seems to take longer than anyone expects and, in fact, is kind of how I ended up in this forum while trying to dig up information about an upgrade to the Eris I used to use.
As of now, there have been 3 leaked versions (read: beta test versions), and none of them have been perfect, though the last one looks like they are close. Aside from this, and the occasional rumor, you will, unfortunately not hear any dates given for the actual rollout. I'm sure this is not on purpose, as Verizon does not want anybody to get their hopes up with "promised" dates that may, for one reason or another, not be met.
So, sit back, relax, and enjoy your phone how it is, the OTA will be here eventually.
b33 