About five days ago I pushed an Acorn 6.1 alpha up to the latest builds page. This build includes all the new Metal changes, without any disastrous consequences (which I was afraid might happen).
This is good and makes me happy.
So if you'd like to try out the new Metal 2 changes in Acorn I've been blogging about, head on over to the latest builds page and grab a copy. There's even some handy links provided over there which will automatically update your direct version of Acorn to the development builds.