Can you point to the fine print on Verizon's web site? I know that the various media sources state free 16GB, but that could very well be a way to get page views. Most people don't wants to hear $99 for a 64GB iPhone. They want FREE.
Also, unless Verizon explicitly states "Offer good on 16GB iPhone 6 Standard only" I would certainly question if it is available on the 64 and 128.
Heck, I would question it anyway. If they want to keep your business, they should extend the offer to make customers happy.
I can't even find that it's still up any more. Can anyone else?