I am confused about the exact day the Scourge Invasion begins.
The blue post mentions that “WoW Classic Version 1.13.6 will go live on December 1”, and then says: “The Naxxramas raid and Scourge Invasion content will unlock at the same time for all realms in the world on December 3”.
So when exactly the scourge invation begins in Europe? is it December 3th or 1st?
re-read your topic, and take a wild guess
You said it yourself. 
So it is on December 3.
What new things apart from Naxx and the Scourge event will be available from phase 6 on December 1st?
In the EU? Nothing.
Hunter changes, bug fixes, gcd proc changes, and some non-naxx drops such as a new conjure food rank may become available on the 2nd though.
We don’t know for sure yet, but most likely anything not directly related to the invasion and naxx listed here: https://us.forums.blizzard.com/en/wow/t/wow-classic-1136-ptr-patch-notes/667443
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