It looks like HarperCollins’ GreenWillow imprint will be reissuing several of DWJ’s most difficult-to-find books in January 2012. So far, it looks like these reissues are for the Kindle and Nook (so far). It’s unclear whether other formats (like new paperbacks) will follow. Jones’ official site doesn’t seem to have any information on these upcoming reissues.
The new titles include:
A Tale of Time City, Dogsbody, and Fire & Hemlock will be published by Penguin in March 2012.
ETA: These are US reissues. It’s unclear whether other territories will be receiving these as well.