I understand - the no support. I don't mind at all to do a clean install next monday, just wanted to make sure.
I continue 'playing with RC3 till then and am making notes [a few] :)

P@t wrote:

We don't support in any way release candidate... but you will be able to upgrade from 2.1.0RC3 to 2.1.0.
You just have to overwrite 2.1.0RC3 files with 2.1.0 files (database will not change between RC3 and final release)

Keep this point to you, yes, just do as P@t wrote.
We do not plan to change the database design from now.
If we do that, we will tell you how update it safely, but we do not want to give support on RC in production.
So from the announcement of 2.1.0, please overwrite.
Take care of plugins and... automatic update, automatic installation, my advice is:

Build a test gallery to ensure any change before doing it in production.
;-)