You wouldn't be able to see that channel, that was in contributor chat which is a hidden channel.
Aah no wonder! Though, I can see it right now under general, has it recently become public?
They may have also posted a bit of info on it in other channels, but the main talk about it was in the hidden channel, I assume you mean discussions btw as there is no general.
The coding-advice channel is public.
The discussion about 4.7 was in the contributors-only channel, which is private.
