Hey guys! Today I was serching for some sneak peeks and you won't believe what I found! Here are some related articles taked from CP wiki:

The island is mentioned in the Penguin Band's song Anchors Aweigh.

Rockhopper Island is a tropical and a volcanic island.
Rockhopper in Club Penguin Times stated that there is a restaurant in the Rockhopper Island which would be closed on Thursdays.
It could be possible that penguins can access Rockhopper's Island in the near coming future.
Rockhopper once classified that there is a stinky cheese shop in Rockhopper Island and that shop is closed on Thursdays.
Spike Hike Asked on twitter "What do you guys think is on Rockhopper Island?", giving an indication that we may soon be able to travel to Rockhopper Island.

As we can see here there are some clues suggesting we could be able to go Rockhopper's Island, Rockhopper will be coming to the Medieval Party 2013! May this be when will be able to go to the "far away" island? Here's a pic also taken from CP wiki!