There was only mention of OF2 for Mac and upgrade pricing. I don't recall any blog post or forum post stating that there would be upgrade pricing for the iPhone or iPad. Perhaps signals got crossed?
THe only one I remembered was about buying OF1 for Mac after a certain date and getting OF2 for free.
http://www.omnigroup.com/blog/debut-of-omnifocus-2
February 1, 2013 blog post:
[quote]From now on, anyone who purchases OmniFocus 1 from our online store will receive a free upgrade to the Professional edition of OmniFocus 2 when it ships.[/quote[