You are all aware Unity 8 is not ready yet, so, should questions about it be off topic?
I vote off topic, it is in no way ready yet, perhaps Unix & Linux would take it?
Example question: Snap Launching on Unity 7 But Not Unity 8
It is a program included in a supported version, and the default environment on tablets/phones.
Unless the question is about a bug, or dependant on some unmade feature we should be able to handle many of these questions. Like running various xapps on the desktop, tweaks or installing silos. This stuff should certainly be on Ask Ubuntu.
Unity 8 is in development. So it is off-topic.