Apple just announced Logic 9.1, which supports 64 bit plugins natively, and in 64-bit mode runs 32 bit plugins via a bridge. Other hosts are working on 64 bit versions of their hosts.
So...how do we write 64-bit plugins in Juce? The 64-bit processing doesn't seem that confusing (I can figure out where to replace float with double, or come up with a MY_FLOAT definition), but how do we specify which render function to call? Obviously, we need to support both 32 bit and 64 bit plugins for the time being. And do the various setParameter() and getParameter() functions need to be 64 bit?
Feel free to point me to other threads that discuss this, if need be. The whole 64 bit thing seems like a pain to deal with, as very few DSP operations need precision beyond 32 bit floats (low frequency resonant/notch filters and some level detectors being the main exceptions I can think up). But it looks unavoidable at this point.