Steve Kopp just shared status a few hours ago.
For Desktop users who want to use the new elevation analysis services, there is now a patch available to make the hydro services show up in your ArcCatalog window under Ready to Use services. No more "Add ArcGIS Server" connection.
ArcGIS 10.2.1 & 10.2.2 for Desktop Hydrology Tools Ready-to-use-Services Patch | Samples and Utilities
Just want to throw out there that these neat services leverage efforts USGS and EPA have been cranking on for years (with lots of help from the Esri ArcHydro and Spatial Analyst powers that be) on projects such as StreamStats and NHDPlus. The leveraging kind of goes both ways.
Push through that envelope! Woo hoo!
Yes, for the US this project is based upon NHDPlus, which is the authoritative national source for the US, and saved us many man-years of effort. Huge thanks to the NHDPlus project team.
And for the international services big thanks to Bernhard Lehner and World Wildlife Fund for their work to build HydroSHEDS.
We are accepting contributions through the Community Maps program for higher resolution authoritative hydrologic content for additional areas.