What will happen? Absolutely nothing.
Bitcoin was meant to be decentralized and open this seems to be quite the opposite imo
And it still is, but that doesn't mean groups of people can form their own boys club. Let them have their secret meetings. It doesn't matter.
They are probably discussing developing the infrastructure further. Its a meeting of smart people. They are already making money with theiur existing ideas, and don't need a meeting just to make more.
they could have had the meeting on skype if they wanted to ,just because the venue is a remote island doesnt make much differnce IMO
it may be to address important issues such as switching to the incoming hard fork and other things that need to be in sync
i would assume they all want to switch to the new fork at the same time to prevent transaction mixups at the exchanges and all sorts of important shit