I haven't seen any news on the matter. This is by far the most upvoted feature.

Have you talked to support about this? I hadn't thought about this myself but I feel like it should be possible based on the available options

This is currently in beta https://meraki.cisco.com/blog/2016/09/no-url-left-behind/

SD stands for software defined (I assume) it has always just been referred to as IWAN. https://meraki.cisco.com/iwan

This is beginning to be rolled out in the dashboard.