You are eligible for a complimentary year of Revel Premium and a refund for the unused portion of your subscription.
See this post for other related questions: I am a paid subscriber, what does that mean for me?
Thank you for the help. However, after following the instructions in http://forums.adobe.com/message/5015251#5015251, nothing seems to show for my account. When I look at the app on my iPhone, I have 28 days of ulimited imports remaining and the option to upgrade to Revel Premium, for a price. I originally signed into Revel with my Photoshop account on my PC instead of via the app - could that be the issue?
If you were upgraded to the Premium Revel account, then you should not be getting the expiration warning. Let me do some research and see what I can find out for your situation.