Tom works at least as hard as I do, but in a less visible way, so he doesn't always get the credit. Today is different though: Tom has done a huge amount of work and got the official Scirra Arcade up and running. It's the very first release so there may be a few kinks to work out, but we're very excited about it and have a lot of plans for what we can do with it in future too. There aren't many HTML5-only arcades around (they usually have some of that pesky Flash around!) so this gives you a shiny new place to show off your game. This build can export your games to a zip file that you can upload to the Arcade - see the tutorial on uploading to the arcade for more information (since it's early days there are a couple of limitations too, so make sure you read up).
The rest of this build is generally maintenance: watch out for the breaking change with auto-mirror, and WebGL should work a bit better now too. Hopefully this means you can upload WebGL-enabled games to the Arcade for better performance!