Over on the Tuts+ site a new tutorial has been published, written by Omar Shehata. It covers the topic of creating a multiplayer game in Phaser:
"Creating multiplayer games is challenging for several reasons: they can be expensive to host, tricky to design, and difficult to implement. With this tutorial, I hope to tackle that last barrier.
This is aimed at developers who know how to make games and are familiar with JavaScript, but have never made an online multiplayer game. Once you're done, you should be comfortable implementing basic networking components into any game and be able to build on it from there!"