Will there be a new ArcGIS API for Silverlight that will be 100% compatible with ArcGIS Server 10.4 (I know a lot of 3.3 API works, but I also know that older APIS never completely work and have to be adjusted).

I also know that Esri is retiring 3.x on 2016-06-01, I'm thinking there's a good chance that there will be no new release. Can anyone confirm this?

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No. I had the Deprecated Features for ArcGIS 10.3.1 and 10.4 Releases open in my browser and didn't read down all the way. It's right in there:

[Added January 24, 2015] ArcGIS API 3.3 for Silverlight and ArcGIS Viewer 3.3 for Silverlight will be the final releases.

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