Esri just announced the latest release of ArcGIS Javascript API 3.9. Notable updates in this release are the new CSV Layer and a new symbol style for continues color (colour) ramps.

A full list of new features for the ArcGIS Javascript API 3.9 release can be found in the on-line documentation.

It hasn’t been that long since 3.8 hit the scene back in January - I think this shows how important the JavaScript is to Esri these days.