>No, it's using the regular JavaScriptCore engine (nitro) that normally goes with WebKit. But it does have the JIT engine enabled, it's fairly close in performance to V8.

Awesome! I've mostly been using node.js (which is built using V8), but I've also been keeping an eye on the Javascript arms race in general, so a nitro powered MoI should be pretty hot as well. It's too bad IE9 wasn't coming out about a year earlier, you might not have needed to go to all this trouble.

With all the raw scripting performance you're going to have in the new version, hopefully you'll be able to expose more functionality to the scripting API as well...