After the release of GO Lang from Google on 2009, we didnt hear any thing from our search giant.May be the last one that I head is appengine supports the Go lang , mean while the cost of appengine increased like anything. Every one was busy with Android and the Motorola's acquisition by Google. So what is DART ? No idea. They are not ready to reveal any thing till October . On October they may release the brief on GOTO developers conference . May be that conference may be for this new programming languages release. But we may expect this may change the web programming or no one cares.