It would seem that the filming of Harry Potter and the Goblet of Fire is still happening according to HP4U. Under heavy security the film, taking place at Black Park, which situated between Slough and Uxbridge, included scenes with Hagrid, Harry, Bill and Madame Maxime, all done at night.
Filming right now (picture Hagrid asking Harry to meet him in his cabin for a surprise!) are night scenes with Hagrid, Harry, Bill, Madam Maxine & Co. Of course then, there are the Dragons! Obviously the dragons will be CGI based (and no doubt brilliant at that), but as with the award winning Buckbeak scenes, there is the use of a prop Dragon which we tried so damn hard to get a shot of, too no avail. We can confirm its there and in one of the shots you can see part of it under wraps.
You should definitely read the Other Facts in the report which state that: “They HAVE been doing set up shots for Order of the Phoenix, not here but at many of the studios, NOT actual filming yet.”