"At the moment we don't know where to go with it," Nigel said.
"We're aware that the fans are waiting for something to happen - but we don't want to have the same old stuff you can get elsewhere.
"We want to make it a bit of fun - and a bit silly."
The idea for Rupert's official site first came up about a year ago - after the release of the first Potter film.
Rupert's dad said he was keen to have Rupert's "actual involvement" on the website.
That could include:
a message board with Rupert posting
- a film diary of Prisoner of Azkaban
Rupert's already back at Leavesden Studios in Hertfordshire doing some "pre-production" stuff for Azkaban.