There maybe many users don’t know about the new forum, so i suggest either redirect them here directly or put the new link on old forum page (( SS4 Old Forum ))
I’d go with a link, I’ll ask the team to do that.
Redirect would be bad, as the original forum still has a lot of content
This is already on the todo list (linking to here from there), it just got moved to the post-live phase. 
Is this in regards to the old link at https://www.silverstripe.org/community/forums ?
Adrian from Web Hosting UK