The work on the Blaze end is done. What's more, even the work on Vue end is more or less ready as a pull request. What's missing is an OK from core Vue team to implement this PR as it requires some changes in how Vue is being developed.
Once this is done though, Blaze would be working with Vue under the hood, getting access to most of Vue fancy features.
I still prever pure Vue though, and if Blaze at all, then only with manuel:viewmodel package.