Does anyone Knows when the the Addon release ?

Since last patch 1.0.0.9 it s very quiet to Grim Down, is the support stopped?

If you mean the expansion, it's stil a work in progress and Crate haven't been quiet about it at all. There are regular updates in the GD Expansion News thread on the GD website and they often stream new content on Twitch on Fridays at 2pm US East Coast time. Last Friday's stream was of the new Necromancer mastery which is coming as part of the expansion.

Latest estimate for the expansion at the end of May was another couple of months' work still to be done on it and then it has to go into testing.