Outreachy intern maudite and I tried out remote pair programming with the new Teletype plugin for Atom, and it’s really nice! At this point, it only works with Atom, and doesn’t yet support voice or video or browser sharing — we used Hangouts for that — but for the core features of working through code together, it does a really nice job.
In the future, Teletype may also allow cross-editor collaboration, so that each person can use whatever code editor (and fonts, and keybindings, etc) that they prefer.