Indeed very promising. It's worth checking out the vue (in)compatibility section of the readme: <a href="https://github.com/vuejs/petite-vue#vue-compatible" rel="nofollow">https://github.com/vuejs/petite-vue#vue-compatible</a>
While this is currently in alpha, this has tremendous potential as it makes Vue even more "progressive" framework by giving ability to downsize to 5kb when necessary.