I think it would be a great Idea to allow people to register clans on the website ahead of time. I have noticed that the profiles already run on some sort of group membership form of tracking so this shouldn't be a huge issue. This will be helpful for people who are planning to play in the open beta and already have a group of friends. It will help to build up anticipation and awareness by word of mouth.
Later on some type of web based advertising and database of clans and their play styles might be a valuable tool to enhance the website utility and give players on noobie island additional reasons to move to the main island with some idea of what to do next. It would also allow the clans a means of advertising for more members and be a possible use for premium currency!!!!
The devs should really consider this before clans start to create their own websites or use other sites that provide clan management services.