I do think the end of April is doable. I don't see a reason to drag it out more than that. But then again, Verizon does strange things.
The problem is that yearly upgrades are a thing of the past. That means we won't be able to upgrade our phones to 4G/LTE until April 28, 2013.
On the plus side, maybe that means we would get unlimited 3g data for 2 years opposed to a capped plan @ $50.