That's the one I watched. After rooting around the GWT Elemental code over the past week, I think that there is no Elemental 2.0 at the moment (or, at least, there's no public Elemental 2.0 at the moment). None of the Elemental code I saw used JsInterop, Elemental still used a lot of stuff borrowed from Dart to generate its code, its code is generated from WebKit interface definitions, and it doesn't seem like anyone is really working on Elemental at the moment (it still has the same bugs and annoyances that have been there for years). As far as I can tell, Elemental 2.0 and JsInterop are more in the "future plans" category.