No. I have the Fire2 also. Haven't tried yet out of other things to do. Noticed a couple of entries indicating that root process for HD worke on Fire2, so apparently there are not huge differences other than screen. Thought there might be some general info out here. Would be nice to whether HD apps are optimized for HD but work on 2 or not to be trusted or what.
I expect I will find out some over the next couple of days.