The sign up section has been moved to a separate page, the confusingly interchanging usage of tech jargon like "instance" and "server" has been removed in favour of "community". The questions "can I move my account later" and "can I talk to people from other communities" is answered upfront. Categories are now at the front and the communities are grouped by language with a prominent language filter option. Communities that don't offer instant sign-up are now clearly marked as such upfront.
@Gargron I like the term Community. Seems obvious, in retrospect, which the best terms usually do.