Thank you for this great suggestion! We have released Iray Render Plug-in for iClone 7 and Character Creator 3. Check the details of the Plug-in here: https://www.reallusion.com/render/iray/ Reallusion
Octane request morphed into V-RAY RT. This is because V-RAY RT is a biased renderer - which makes it suitable for animation. iRay is unbiased like indigo - so it's better suited for architecture. Another advantage of VRay RT compared to iRay is that Vray can split rays - which makes it faster. VRAY RT uses the GPU as well. Of course this all depends on what you want to do. Most people use iClone to speed up animation, so they would best benefit from a renderer whose algorithm works well for animation. If you'd like to vote for V-RAY RT here's the link: http://www.reallusion.com/FeedBackTracker/Issue/Octane-Renderer-Plugin
Yes, I agree that would be great... AFTER we get a new real time renderer that includes proper PBR support. Others promote Octane. I would vote for Iray to be the next "3rd-party rendering plug-in" but currently I'm using my votes for things that are a higher priority for me. Hopefully I'll be able to cast a vote in this direction as soon as a couple other items become fixed for me.