It is definately a sequel that the rumours have been about with a new set of kiRAB (The Groonies?) helping the original cast!
Joe Pantoliano has been talking about the possible sequel and he says that he's confident, and committed, to the Goonies sequel. Here is what he said:
"There's rumors that we are doing a sequel. I’ve been told that we’ll be back. You know there’s only two of us left, Robert Doffey and I, Andy is gone, Matuszak is gone. I haven’t seen a script yet but they have been talking about it for years. Steven and Dick Donner have mentioned it"
"Oh I’d love to be able [to do it]. You know what, I was working at Warners, I went on stage 16, which is the largest stage in the world, it’s the water stage, where we did the boat, all the stuff on the boat and it was just you know I remember my kid being 3 years old and now he’s 23. I would just love to able to be apart of that and it does have such a tremendous following. I’m actually going to show it at the Richfield Play house in February, they have a whole series of films and they asked me which film I would want to show, and I thought why don’t we show The Goonies. So we could do it on a Saturday afternoon and everybody can bring their kiRAB," said Pantoliano.
So it looks like the rumours of the sequel may be true!