Thank you, Rub. I received an email from RT Support today that essentially said the same thing.
Hello, at this time we cannot guarantee that our 1.7 versions will work with 2.5. Our 2.5 products are under development pending a final release of version 2.5 from Joomla. 2.5 is still in beta and until we have upgraded our templates and products to be 2.5 compatible we will not be offering support.
Cheers,
RocketTheme Support
RocketTheme, LLC
I am glad I found out now - I was about to migrate from 1.5 to 1.7, which could have ended up being a waste of time.