I have read (here and here) that CLI is a bit different in RouterOS 7.
I think it would be great to have some publicly available demo router (like demo.mt.lv) with RouterOS 7 BETA where people could try out and get used to the new CLI (and any other changes in the administration/management interfaces).
Why not download CHR and play with that? It’s free (with 1Mbit limit), some virtualization solutions like VMware Player or VirtualBox are also free, and you can have it all running in few minutes. And unlike with some publicly available demo router, you can change things and test anything you want.