Thanks, OP!
I called Verizon last night and added this promo to my "More Everything" 3 GB plan. My wife and I initially had a 2 GB plan on Share Everything which went to 3 GB when More Everything came out last week.
When I called in asking about the 1 GB promo, the rep initially thought I was referring to the bump from 2 GB to 3 GB with More Everything. I said, "No, I think you guys are running another promo that gives an additional 1 GB for one year." She put me on hold for a minute, came back, and said that she wasn't aware of the promo until right then but that I was correct. She added it to our account within about 20 seconds. The promo data is valid from February 9, 2014 through March 8, 2015. There was no contract extension required to take advantage of the promo.
The Verizon rep seemed more excited about the 1 GB for one year promo than I was. She said, "Wow, you're getting 4 GB of data now for the same price you had been paying for 2 GB -- that's an amazing deal!"
Now, when I pull up our account in the Verizon iPhone app, it lists "Shared Promotional Data" as a separate item than "Shared Data". We have 1 GB under "Shared Promo Data" and 3 GB under "Shared Data". Also, the 0.8 GB of data we've used so far this billing cycle moved over to the "Shared Promo Data" bar graph after the change was made to our account so I guess the promo data gets used first and then it transitions to the normal bucket of data after 1 GB.
Thanks again, OP!!