I’m not sure what version of Meteor the Node 8.12.0 changes will land in, given the uncertainty of the Node release timeline, and given that #9942 is looking pretty stable these days. We’ll put this PR into a milestone once we have a better idea about the timing.
As written when Node.js 10 reaches LTS you will see the next Meteor version with it. If you want to help @benjamn you can start a pull request with the initial work. I think that will be much appreciated.