While it's always good to be cautious with IMDb.com's reports, it seems very likely that the two will be producing the film.
Allison Abbate was a producer on Corpse Bride, as well as other animated films (stop-motion and otherwise) including Brad Bird's The Iron Giant and currently Wes Anderson's The Fantastic Mr. Fox. Mr. Fox and Frankenweenie are both set for a 2009 release, with the latter scheduled for December.
Allison Abbate and co-director Mike Johnson promoting
Tim Burton's Corpse Bride at Comic-Con in 2005
Don Hahn was also a producer on many of the animated films from the so-called "Disney Renaissance" of the late 1980s and 1990s, such as Who Framed Roger Rabbit, Beauty and the Beast, and The Lion King. He was also a leading producer on the 3D theatrical re-release of The Nightmare Before Christmas in 2006. Like the re-release of the cult classic musical, Frankenweenie will be shown in 3D in theaters, among numerous other future Disney releases. Pixar and Disney have decided to work exclusively in 3D for many of their upcoming films, on various forms of animation and even on some live-action movies. Specifically, Hahn will be an executive producer on Frankenweenie.
Tim Burton will also be a producer on the stop-motion film, reportedly.
The movie website also stated that filming has commenced on Frankenweenie. This would make sense, as stop-motion animation is a tedious process (despite the film being deliberately low-budget, as Burton wanted). No updates on the screenplay or casting have come up. Frequent Burton collaborator Chris Lebenzon will likely serve as editor.
Again, it is always good to be wary of announcements on IMDb, but we feel confident with this information (plus, the author of these articles is already getting very anxious for these upcoming Burton films). We will keep you posted of any updates!