So basically the best bet would be to not have a brand new edition, but to revise the existing corebook... make it 1.1 or something. The basic game is good, but since the Mongeese (sp?) have a lot more experience now, they should be able to drastically improve on many features. I would love to see more Dredd products released, and if having a new version means we get other new sourcebooks released then I'm all for it. Although, any new version must be backwards compatible or all of the previous books would become obsolete and no longer profitable for Mongoose. If they upgrade the rules slightly, ironing out some of the sticking points from the 1st edition, then the other books in the series may also see increased sales.
Adventures are high on my wanted list. I'm sure that many people submit works to Mongoose, and a lot are not published... but although there isn't a huge profit in adventures, surely there is enough. Afterall, all the publisher needs to do it proofread the work, maybe get some playtesters to run through it (for free), get some nice artwork, and send it to the printers. I would imagine the hardest and most time consuming part would be writing the adventure in the first place... but once they have the submissions...
Arabin