Quick update: Node.js version 0.10.26 is now available for apps on RUN@cloud.
If you run the clickstart for node.js - it will automatically use this. If you are using a recent Node.js clickstack - you can also update by restarting your application with the runtime parameter of -R node.version=0.10.26.
There has been some "challenges" recently with public NPM repositories - if you see certificate errors you can put "npm config set ca=""" in your build script (at the time I tried - it wasn't a problem however).