Hi Cyberdyne,
yes it was pretty embarassing to go to the ADC this year running an ancient JUCE version and there are a ton of cool features that have been added since then (a better convolution engine, DSP algorithms and many improvements for iOS).
It's definitely on my top priority list to take the leap to the current JUCE version, but it involves changing the entire build procedure and modifying the JUCE codebase with the few custom additions I made for HISE. Don't hold your breath for it (but I try to do it this year).