I do hope it will have other ip control opportunities, not just Crestron, Crestron is way too expensive. Adding cec support to control volume would be a game changer (really no option to leave it out with an earc hdmi port). Cec to support Hdmi switching (aggregate multiple hdmi inputs before the arvus) would also be an use case. Also hope Dirac support is still in as mentioned in another thread, no mention anymore on the webpage. I would strongly prefer this above a jbl sdp, if volume control would be less barebones as it now seems to be.
I use Kramer Control. It's a lot cheaper than Crestron. Typically, with companies they just say it's Crestron compatible as marketing because they are one of the biggest names. However, with the control protocol, Kramer or anyone else can easily write a control driver. For Kramer, you just need the hardware, the SL-240c or the SL280 and a programmer or become one yourself.
If you think about it, a prepro is really just a bunch of different hardware, video switcher, decoders, volume control, all inside one box. I don't care if the components are contained within a box. With the right control platform, you can make all of the external devices function the same as prepro. Touch one button on your cell phone and get a preset volume, video switching, etc. It's very easy to do this with Kramer or of course Crestron.