Introducing Conditional Access by Network Location for SharePoint and OneDrive for Business

Hi - can we have an update on the general thinking with this feature and whether or not it might be introduced at site collection level? I'm prompted by the post 5 hours ago about site collection specific IP restrictions. This was hinted/discussed a fairly long time ago and would be an excellent feature that would help address lots of security issues for us. Something similar already exists for external sharing restrictions which can be both at tenant and site collection level.

For example, we have a current project where we will be creating some planning, analysis and evidence capture artifacts in a particular site collection. This site collection will be accessed from a finite number of sites and on occasion by staff using VPN solutions such that an IP restriction would be of significant advantage and allow us to rely on both the physical security of the associated locations as well as device security of the associated networks. We don't have the same requirement for other content and IP range restrictions would be a burden rather than an advantage for all other site collections.