Is there any official release date for this yet...at least a public beta? Has there been any announcement at the recent Dev Summit? At the Europe one back in November, it was announced a public beta will be out by the main Dev Summit in Palm Springs, with a final release in the summer.
Can't see anything on the Beta Community site, except that JavaScript based ArcGIS WebApp Builder which will be available for public beta by the end of the week.
this isn't js 3d Esri but you can fun with webgl 3d framework. I have made a very easy test sample with leaftlet/webgl.
here you can see my test with service area from gp: >WebGL Earth + ArcGIS Online Tiles - Service Area Task
@Andy Larkin: Beta with 3D will be available in March 2015.