Auto-mixing! If it's done well I would welcome it. The first thought is to make sure you can link multiple consoles together. I'm not sure that
all the mix buses need to be shared but the auto-mix "logic" should be shared so that systems with more than 32 inputs can be built (or so that multiple "small block" x32s can be assembled together). I have several other ideas pertaining to this but I'm not sure I can share them for free.
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Also, the high pass for the talkback is an excellent idea and one that I'm surprised wasn't in at least ver 2.0. A talkback mic is a very obvious place to use a robust high pass filter and it can often mean the difference between being understood [on stage] or sounding like unintelligible mush.